Sedimentary rock classification chart

sedimentary rock classification chart in Table 2 to give each rock its proper name. Once you have finished describing and identifying the samples in your lab tray, we will ask you to demonstrate your ability to correctly classify sedimentary rocks by taking an in−class quiz. PART 3: Interpreting Sedimentary Environments from Sedimentary Rocks

There are two major groups of sedimentary rocks: 1) siliciclastic and 2) chemical and organic. Visible layering is common in sedimentary rocks. Most fossils are found in sedimentary rocks; exceptions are specimens found in metamorphic rocks that were once sedimentary (e.g., fossil shells in marble) or those found in ice (e.g., remains of mammoths).Table 4–6 Cementation chart 4–6 Table 4–7 Rock color 4–7 Table 4–8 Particle-size descriptors for sedimentary and pyroclastic 4–8 rocks Table 4–9 Permeability of rock 4–10 Table 4–10 Discontinuity types 4–13 Table 4–11 Descriptors for shape of lithosome 4–13 Table 4–12 Summary of the influences of fracture attributes on ...Online Sedimentary Rock Study Guide Prof Brande has also created for you an online guide to the identification of the common sedimentary rocks, in the style of the OMG, theOnline Mineral Guideyou used previously. This one is simply theOnline Sedimentary Rock Guide. Access the chart atSedimentary Rock Classification Chart …Soil and Rock Classification and Logging NYSDOT Geotechnical Page 5-4 June 17, 2013 Design Manual 5.1 OVERVIEW The detailed description and classification of soil and rock are an essential part of the geologic interpretation process and the geotechnical information developed to support design and construction.Jan 8, 2020 · 4.3 IDENTIFYING SEDIMENTARY ROCKS. Classification of sedimentary rocks is largely based on differentiating the processes that lead to their formation. The biggest division in sedimentary rock types is based on the primary type of weathering that leads to the material building the sedimentary rock. According to the Sedimentary Rock Classification Chart (not the Key), limestone is an example of a _____ sedimentary rock. chemical. The two processes that, either alone or in combination, can convert pre-existing non-metamorphic rock into metamorphic rock are. heat and pressure.Entire document, without Color Chart and Pattern Chart (28.2 MB) Title page (88 KB) Table of Contents (52 KB) ... Section 33 -- Suggested Ranges of Map-Unit Colors for Volcanic and Plutonic Rocks and for Stratigraphic Ages of Sedimentary and Metamorphic Rocks (56 KB) Section 34 -- State Location Maps (376 KB)

The Three Types of Rocks. Rocks are classified based on how they were formed. The three major types are igneous, sedimentary, and metamorphic rocks. This classification is essential to geologists as it provides critical information about the history of specific regions on Earth. These rocks change forms via the rock cycle.SEDIMENTARY ROCKS form from material that has accumulated on the Earth's surface. The general term for the process of accumulation is DEPOSITION . The material consists of the products of weathering and erosion, and other materials available at the surface of the Earth, such as organic material.sedimentary rock classification chart in Table 2 to give each rock its proper name. Once you have finished describing and identifying the samples in your lab tray, we will ask you to demonstrate your ability to correctly classify sedimentary rocks by taking an in−class quiz. PART 3: Interpreting Sedimentary Environments from Sedimentary RocksSEDIMENTARY ROCKS: 70 Sandstone 71 Limestone 72 Travertine (onyx) 73 Conglomerate ... identity, refer to the mineral key or the rock classification charts.Detrital Sedimentary Rocks. Detrital sedimentary rocks form from detritus, the rock and mineral fragments that are transported by gravity, water, ice, or wind. Detrital sediments are classified by grain size. Detritus is classified by its grain size. Grains larger than 2 millimeters are called gravel . Grains between 1/16 mm and 2 mm are called ...Table 4–6 Cementation chart 4–6 Table 4–7 Rock color 4–7 Table 4–8 Particle-size descriptors for sedimentary and pyroclastic 4–8 rocks Table 4–9 Permeability of rock 4–10 Table 4–10 Discontinuity types 4–13 Table 4–11 Descriptors for shape of lithosome 4–13 Table 4–12 Summary of the influences of fracture attributes on ...Figure 2.11 – Classification chart of igneous rocks based on the mineral content. The top part is a graphical comparison of silica content and mineral content for both extrusive and igneous rocks. To use this graph, you will need to determine the relative abundance of seven common minerals found in igneous rocks.

7.3 Classification of Igneous Rocks. 7.4 Intrusive Igneous Rocks. Chapter 7 Summary & Key Term Check. Chapter 8. Weathering, Sediment, and Soil. 8.1 Physical Weathering. 8.2 Chemical Weathering. ... Thus far you’ve seen that some types of sedimentary rocks—coal, and gypsum, for example—require very specific conditions to form because ...The major controls on the color of sediment/sedimentary rocks are the presence and abundance of organic matter, iron oxidation state and color of major rock-forming minerals (Tucker, 2003 and Stow, 2005).The color of sediments/rocks has some descriptive and genetic implications, for example, black color indicates carbonaceous content and light colors (white, …One model for describing sedimentary facies in the lab or the field is the CTSFAF model. This model uses readily observable characteristics of the rocks and aids in the interpretation of depositional environments. The six aspects of CTSFAF are color/composition, texture, sedimentary structures, fossils, association, and form which are described ...Feb 15, 2021 · Sediments Classification Based On Grain Size. Sediments are solid fragments of inorganic or organic material that come from the weathering of rock and soil erosion, and are carried and deposited by wind, water, or ice. They range in size from large blocks to microscopic particles. Figure 6.39 shows the technical definition of sediment particles. grouping of sediments into respective classes. In the classification of sedimentary rock, composition is the first component preceding texture and structure ...

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The QAP ternary diagram is used to classify igneous rocks with visible mineral grains (phaneritic texture) from their feldspar and quartz content. In plutonic rocks, all of the minerals are crystallized into visible grains. …May 21, 2019 · Sedimentary Rock Classification Diagrams. ThoughtCo/Andrew Alden. This diagram is used to classify sedimentary rocks according to the mixture of grain sizes in them. Only three grades are used: Sand is between 1/16 millimeter and 2 mm. Mud is anything smaller than sand and includes the silt and clay size grades of the Wentworth scale. Expert Answer. 100% (4 ratings) This rock is coquina. Coquina is carbonate rock c …. View the full answer. Transcribed image text: You find a sedimentary rock composed of angular shells that are all roughly the same size. Identify the sample using your Sedimentary Rock Classification Chart. O Sandstone O Shale O Conglomerate O Coquina.sedimentary rock classification chart in Table 2 to give each rock its proper name. Once you have finished describing and identifying the samples in your lab tray, we will ask you to demonstrate your ability to correctly classify sedimentary rocks by taking an in−class quiz. PART 3: Interpreting Sedimentary Environments from Sedimentary RocksThe BGS Rock Classification Scheme BGS Technologies Share this article The BGS Rock Classification Scheme (RCS) provides a comprehensive system for classifying …Lithclass polygon colors. These colors provide the lithologic legend for our state geological map compilation. The data represented by this table are available as a tab-delimited text file. Unconsolidated material. Alluvium. Silt. Sand. Flood plain. Gravel.

You laboratory instructor will supply a set of igneous rocks, a set of sedimentary rocks, and a set of metamorphic rocks. Select a rock, and take the appropriate path below to classify the rock. In each of the sections, you will find brief descriptions of TEXTURES and MINERAL COMPOSITIONS, and a classification chart based on these characteristics.EESB15 sedimentary rock classification chart used (guide). Kristika Raguthas.4. Place the rocks back into a pile and ask what other differences they see. Sort again based on their answer. You don’t need to sort every last rock each time. Some rocks may be difficult to sort depending on the classification. 5. Repeat until you run out of ways to sort and classify the rocks.Learn all about three types of sedimentary rocks. I cover clastic sedimentary rocks,chemical, and organic sedimentary rocks.Clastic sedimentary rocks form wh...sedimentary rock classification chart in Table 2 to give each rock its proper name. Once you have finished describing and identifying the samples in your lab tray, we will ask you to demonstrate your ability to correctly classify sedimentary rocks by taking an in−class quiz. PART 3: Interpreting Sedimentary Environments from Sedimentary Rocks See the Basics page on sedimentary rocks and the sedimentary rock classification table. Sedimentary structures. Sedimentary structures such as cross-beds, graded beds, and mud cracks are useful for determining which way was up in the original sequence of sediments. It is possible for tectonic forces to deform rocks in the crust to the point ...... Sedimentary rocks. In addition to this, a printable 22 page activity booklet contains student activities and answer keys to go along with the Interactive ...1.3 The study of stratified rocks is called stratigraphy. It’s the branch of geology that deals with the description, correlation, and interpretation of stratified sediments and stratified rocks on and in the Earth. Inasmuch as by far the greatest part of the uppermost zone of the earth’s bedrock is sedimentary rock,Feb 2, 2017 · Classification of Sedimentary Rocks. Sedimentary rocks are classified as clastic (lithification of broken rock fragments of varying sizes) and chemical/biochemical (precipitation and crystallization of dissolved material (Tucker 2001) (Table 2). Clastic rocks are subdivided on the basis of clast size and shape, which are indicators of source ... Sedimentary rocks are classified on the basis of the texture (grain size) of the rock, and composition. The basic classification only concerned texture, using the Wentworth size scale.But any full rock name must specify both texture and composition. Thus, an arkose sandstone is a rock of sand sized particles, with a high percentage of those particles being feldspar.Oct 26, 2000 · QFL stands for Quartz, Feldspar, Lithics. Sedimentary rocks are classified on the basis of the texture (grain size) of the rock, and composition. The basic classification only concerned texture, using the Wentworth size scale. But any full rock name must specify both texture and composition. Thus, an arkose sandstone is a rock of sand sized ... Rocks are classified into three main types based on their formation process: igneous, sedimentary, and metamorphic rocks. Each type of rock has its own characteristics and is formed through different geological processes. Igneous rocks: These rocks form from the solidification of molten material called magma or lava.

Oct 19, 2023 · Sedimentary rocks can be organized into two categories. The first is detrital rock, which comes from the erosion and accumulation of rock fragments, sediment, or other materials—categorized in total as detritus, or debris. The other is chemical rock, produced from the dissolution and precipitation of minerals.

Figure 7.13 Classification diagram for igneous rocks. Igneous rocks are classified according to the relative abundances of minerals they contain. A given rock is represented by a vertical line in the diagram. In the mafic field, the arrows represent a rock containing 60% pyroxene and 40% olivine. The name an igneous rock gets depends not only ...Sedimentary Rocks. Sedimentary rocks are one of the three main types of rocks found on Earth, along with igneous and metamorphic rocks. They are formed through the accumulation, compaction, and cementation of various sediments over time. Sediments are fragments of rocks, minerals, organic material, and even chemical precipitates that have been ...SEDIMENTARY ROCKS form from material that has accumulated on the Earth's surface. The general term for the process of accumulation is DEPOSITION . The material consists of the products of weathering and erosion, and other materials available at the surface of the Earth, such as organic material.Depositional environments. Sedimentary rocks are formed by 5 processes, there are erosion, weathering, transport, deposition, and diagenesis process (Boggs, 1991). These 5 processes with 4 types of rocks make up a cycle that is known as sedimentary cycle. The properties of sedimentary rocks such as sediment textures and structures, are formed ...Diatomite is a sedimentary rock with many uses. It is made up of the siliceous skeletal remains of diatoms, which are tiny single-celled algae. Diatomite is crushed into a powder known as "diatomaceous earth". It is lightweight, porous, relatively inert, and has a small particle size along with a large surface area. Table 4–6 Cementation chart 4–6 Table 4–7 Rock color 4–7 Table 4–8 Particle-size descriptors for sedimentary and pyroclastic 4–8 rocks Table 4–9 Permeability of rock 4–10 Table 4–10 Discontinuity types 4–13 Table 4–11 Descriptors for shape of lithosome 4–13 Table 4–12 Summary of the influences of fracture attributes on ... Rock Identification Tips. First, decide whether your rock is igneous, sedimentary or metamorphic. Igneous rocks such as granite or lava are tough, frozen melts with little texture or layering. Rocks like these contain mostly black, white and/or gray minerals. Sedimentary rocks such as limestone or shale are hardened sediment with …This page titled 4.16: Metamorphic Rock Classification is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. LICENSED UNDER.Jan 11, 2021

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In using the sedimentary rock classification table that accompanies this section, you will see that the clastic sedimentary rocks are classified on the basis of ...Table 4–6 Cementation chart 4–6 Table 4–7 Rock color 4–7 Table 4–8 Particle-size descriptors for sedimentary and pyroclastic 4–8 rocks Table 4–9 Permeability of rock 4–10 Table 4–10 Discontinuity types 4–13 Table 4–11 Descriptors for shape of lithosome 4–13 Table 4–12 Summary of the influences of fracture attributes on ...2.4 Here’s a list of what you can look for in a sediment rock or a sedimentary bed that might tell you something about depositional environment: grain size grain shape grain surface texture grain fabric sedimentary structures composition (siliciclastic; carbonate, evaporite, coal, chert) fossils (body fossils, trace fossils) stratification ...In addition to mineral composition and lithification process, geologists also classify sedimentary rock by its depositional characteristics, collectively called facies or lithofacies. Sedimentary facies consist of physical, chemical, and/or biological properties, including relative changes in these properties in adjacent beds of the same layer ...In this article we will discuss about the classification of sedimentary rocks on the basis of the nature of sediments:- 1. Mechanically Formed Sedimentary Rocks 2. Chemically Formed Sedimentary Rocks 3. Organically Formed Sedimentary Rocks. 1. Mechanically Formed Sedimentary Rocks:Rock Classification Numerous systems are in use for field and petrographic classification of rocks. Many classifications require detailed petrographic laboratory tests and thin sections, while others require limited petrographic examination and field tests. The Bureau of Reclamation (Reclamation) has adopted a classification system which is ...GEOL 1403 Physical Geology Lab 08-Sedimentary Rock Page 2 Prof. J. Mohr Activity 1 - Classification Specific Learning Objectives for This Activity After completing this lab, you should be able to recognize and describe features in samples of sedimentary rock classify a sedimentary rock by composition, texture, and other features identify a sedimentary rock by name from its observable features ... Online Sedimentary Rock Study Guide Prof Brande has also created for you an online guide to the identification of the common sedimentary rocks, in the style of the OMG, theOnline Mineral Guideyou used previously. This one is simply theOnline Sedimentary Rock Guide. Access the chart atSedimentary Rock Classification Chart Explore the website ...Sedimentary rocks can be organized into two categories. The first is detrital rock, which comes from the erosion and accumulation of rock fragments, sediment, or other materials—categorized in total as detritus, or debris. The other is chemical rock, produced from the dissolution and precipitation of minerals.Classifications diagrams for siliciclastic sedimentary rocks are based on the content of sand, silt, and clay (Shepard 1954) and the three types of framework grains (Folk 1980).This reddish rock is arkose, a young feldspathic sandstone. Andrew Alden / Wikimedia Commons. Arkose is a raw, coarse-grained sandstone deposited very near its source that consists of quartz and a significant …SEDIMENTARY ROCKS: 70 Sandstone 71 Limestone 72 Travertine (onyx) 73 Conglomerate ... identity, refer to the mineral key or the rock classification charts. ….

ES202 Lab 3 - Sedimentary Rock Analysis and Classification Update Jan 14, 2016 Part 1 A. Cambridge Intro Rock Video Questions (ROCKSandMINERALS_cambridge_science.mpeg; Time Mark: 12:40) 1. What is the definition of a “rock” ... Using the attached grain size chart and the Wentworth scale, determine the grain-size of the following ...Objective: Students learn how to read a sedimentary rock chart. Mt. Brockman ... Be sure to examine each specimen using the classification charts to help you.In using the sedimentary rock classification table that accompanies this section, you will see that the clastic sedimentary rocks are classified on the basis of ...Metamorphic Rocks: Photos, descriptions and facts about foliated and non-foliated metamorphic rocks.Sedimentary Rock Classification. Sep. 9, 2014 • 0 likes • 9,436 views. Download Now. Download to read offline. Engineering. Sedimentary Rock Classification. Medo Hamdani Follow. Engineering Technologist at Medo Hamdani.08-Jul-2014 ... ... sedimentary rock nomenclature, Jour. Geology 62, 344–359; © 1954 by ... charts of the northern Great Barrier Reef lagoon. Aust J Earth Sci 46 ...PDF | On Jan 1, 2004, F. T. Mackenzie published Sediments, Diagenesis, and Sedimentary Rocks | Find, read and cite all the research you need on ResearchGateLecture 1: The Nature, Description, and Classification of Sediments (PDF - 1.1 MB) Lecture 2: Physics of Sedimentation (PDF 1 - 6.8 MB) (PDF 2 - 8.3 MB) Lecture 3: Sedimentary Structures (PDF - 4.1 MB) Lectures 4-5: Siliciclastic Rocks (PDF - 1.7 MB) Lectures 6-7: Carbonate Sediments and Rocks (PDF - 3.3 MB) Lecture 8: Cherts and EvaporitesIn this article we will discuss about the classification of sedimentary rocks on the basis of the nature of sediments:- 1. Mechanically Formed Sedimentary Rocks 2. Chemically … Sedimentary rock classification chart, The BGS Rock Classification Scheme BGS Technologies Share this article The BGS Rock Classification Scheme (RCS) provides a comprehensive system for classifying …, Clan designation. As others before him, Folk proposed a classification for sandstones based on the relative abundances of quartz (Q), feldspars (F), and rock fragments (R). These are the main poles of the classification diagram. To define the clan name one must normalize the sum of abundances of quartz, feldspars and rock fragments to 100%., Clastic Sedimentary Rocks; Grain Size Rounding Sorting Rock Name; gravel coarse (> 2 mm) angular: poorly: breccia: rounded: poorly: conglomerate: sand medium (0.0625 - 2 mm) variable: variable: sandstone: rounded to subangular: well to moderately: quartz arenite - >90% quartz: subrounded to angular: well to moderately: arkose - >25% feldspar ..., 4. Place the rocks back into a pile and ask what other differences they see. Sort again based on their answer. You don’t need to sort every last rock each time. Some rocks may be difficult to sort depending on the classification. 5. Repeat until you run out of ways to sort and classify the rocks., Study the siliciclastic rocks on classification chart to familiarize yourself with the characteristics these rocks. 2.Carbonate Sedimentary Rocks - composed of the shells and skeletons of plants and animals that are made of carbonate minerals (calcite, dolomite, or aragonite). The most common texture of these rocks is called , )2 , 5.2.5 Geological Strength Index (GSI) Hoek and Brown (1997) introduced the GSI, both for hard and weak rock masses. Experienced field engineers and geologists generally show a liking for a simple, fast, yet reliable classification which is based on visual inspection of geological conditions. Hoek and Brown (1997) proposed such a practical ..., These grades also can be used in Folk's texture classification for objective sediment description. We reserve the megalith class and five attendant grades for even coarser megaclasts, with dl ..., Sediment Classification and the Characterization, Identification, and Mapping of Geologic Substrates for the Glaciated Gulf of Maine Seabed and Other Terrains, Providing a ... A geologic substrate is a surface or volume of sediment or rock where physical, chemical, and biological processes occur, such as the movement and deposition of sediment, the, Sedimentary Textures The Sedimentary Rock Textures Chart on the following illustrates the major sedimentary rock textures. Below, we defin..., Classification of Sedimentary Rocks by Russell B. Travis Web pages adapted from Quarterly of the Colorado School of Mines, vol. 50, no. 1 Texture: ... The names in the above chart are root names and should be preceded by appropriate terms for any significant feature of the rock. The proper order is color, structure, grain size (sandstones only ..., Organic rocks that are classified as clastic, involve the deposition of plant material and formation of peat and coal deposits. ▫. The physical, chemical, or ..., List the three types of sedimentary rocks. Where and how are clastic rocks found? How do ..., Based on mode of formation, sedimentary rocks are classified into three types, they are: Mechanically formed — sandstone, conglomerate, limestone, shale, loess. Organically formed — geyserite, chalk, limestone, coal. Chemically formed — limestone, halite, potash. Study the NCERT Notes Geography on Earthquake here., Arkosic Sandstone. Rock fragments, mica, clay, quartz. "Dirty" looking, dark colored; sandpapery feel. Graywacke. Very Fine Grains. <1/16 mm. Cannot be seen w/ naked eye. Quartz and clay minerals. Gritty, 1/16-1/256 mm; some grains may be seen with hand lens., The Sedimentary Rock Identification Data Chart is divided into clastic sedimentary rocks, bioclastic sedimentary rocks, and chemical sedimentary rocks. ... Student samples - Sedimentary Rocks Box 2 sample numbers 19-36 CLASSIFICATION OF Sedimentary Rocks STEP 1 STEP 2 STEPS STEP 4 Rounded rocker mineral fragments usually poorly sorted ..., The color of fresh and weathered surfaces is described using a rock-color chart (Goddard, 1948) (see Rock-Color Chart). Rock color is a function of the color and size of the detrital grains and/or the color of secondary minerals that coat them. ... Grabau, A. W., 1904, On the classification of sedimentary rocks, Am. Geologist 33, 228–247 ..., Figure 2.11 – Classification chart of igneous rocks based on the mineral content. The top part is a graphical comparison of silica content and mineral content for both extrusive and igneous rocks. To use this graph, you will need to determine the relative abundance of seven common minerals found in igneous rocks., Related to sedimentary structures are trace fossils, which are patterns in the rocks that are caused by the activity of organisms. These can occur in many different ways and can indicate many different aspects of the environment …, Rock Flow Chart. Displaying all worksheets related to - Rock Flow Chart. Worksheets are The rock cycle, Rocking the rock cycle part 1 of 3, Rocks rocks rocks work, Igneous rocks and the rock cycle, Rock work, Mineral and rock guide booked, Sedimentary rock classification chart, Teachersguide. *Click on Open button to open and print to worksheet., —Field classification of sedimentary rocks (modified after R.B. Travis [1955]) ... Figure 4-5.—Charts for estimating percentage of composition of rocks and ..., See the Basics page on sedimentary rocks and the sedimentary rock classification table. Sedimentary structures. Sedimentary structures such as cross-beds, graded beds, and mud cracks are useful for determining which way was up in the original sequence of sediments. It is possible for tectonic forces to deform rocks in the crust to the point ..., In addition to mineral composition and lithification process, geologists also classify sedimentary rock by its depositional characteristics, collectively called facies or lithofacies. Sedimentary facies consist of physical, chemical, and/or biological properties, including relative changes in these properties in adjacent beds of the same layer ..., A Basic Sedimentary Rock Classification A good classification is based on some theory that explains how the rocks form, and are related to each other. We want to group together rocks that …, Sedimentary Textures The Sedimentary Rock Textures Chart on the following illustrates the major sedimentary rock textures. Below, we defin..., The classification and description of the various clastic sedimentary rock types appears in ..., Jan 11, 2021 · This page titled 4.16: Metamorphic Rock Classification is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. LICENSED UNDER. , Rocks are classified by geologists into three main categories: Igneous; Metamorphic; Sedimentary; Igneous rocks, such as granite and basalt, are formed directly from magma and lava., Clastic Sedimentary Rocks. How Clastic Sedimentary Rocks are Formed: Pre‑existing rock undergoes chemical and mechanical weathering by roots, acid rainwater, gravity, wind, and water. The broken particles are carried through water or air until they settle out in a lower area when the current wasn't fast enough to carry the particles., The QAP ternary diagram is used to classify igneous rocks with visible mineral grains (phaneritic texture) from their feldspar and quartz content. In plutonic rocks, all of the minerals are crystallized into visible grains. …, They are as follows: #1. Igneous Rocks. Igneous rocks are crystalline solids which form directly from the cooling of magma. This is an exothermic process (it loses heat) and involves a phase change from the liquid to the solid state. The earth is made of igneous rock – at least at the surface where our planet is exposed to the coldness of space., In addition to mineral composition and lithification process, geologists also classify sedimentary rock by its depositional characteristics, collectively called facies or lithofacies. Sedimentary facies consist of physical, chemical, and/or biological properties, including relative changes in these properties in adjacent beds of the same layer ..., Sedimentary Rock Classification Table. Clastic Sedimentary Rocks; Grain Size Rounding Sorting Rock Name; gravel coarse (> 2 mm) angular: poorly: breccia: rounded: poorly: conglomerate: sand medium (0.0625 - 2 mm) variable: variable: sandstone: rounded to subangular: well to moderately: quartz arenite - >90% quartz:, Sedimentary Rock Classification Diagrams. ThoughtCo/Andrew Alden. This diagram is used to classify sedimentary rocks according to the mixture of grain sizes in them. Only three grades are used: Sand is between 1/16 millimeter and 2 mm. Mud is anything smaller than sand and includes the silt and clay size grades of the Wentworth …