Sedimentary rocks _ Make up_ updated 1 (1)

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Georgia State University *

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1121

Subject

Geology

Date

Oct 30, 2023

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docx

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Uploaded by ConstableHawk4507

Identification Activity Based on the image, please identify the sedimentary rock correctly and list its attributes. Two examples are included of each type of sedimentary rock. *Please turn in the completed chart below to receive credit for this activity Image Rock Name: Composition: Chemical/Clastic/ Organic Grain size: (clay/ silt/sand/pebble/ cobble/boulder) Sample 1 Sample 1 shale silt and clay other minerals, especially quartz and calcite. Clastic Clay Sample 2 Sample 2 sandstone Mostly quartz, sometimes feldspar, silt and clay. Clastic sand Sample 3 Sample 3 limestone mainly calcium carbonate, a few other minerals include clay, iron Chemical sedimentary rock Boulder

Sample 4 Breccia clast texture, made up of pebble sized clasts that have an angular texture Clastic Pebble Sample 5 Sample 5 arkose sandstone with notable amounts of feldspar, often associated with sediment that's weathered with clastic sand

granite Sample 6 Graywacke has defined sand grains, which is surrounded by a dark-fine grained matrix, and it is often clay rich Clastic sedimentary rock sand Sample 7 Haltite, rock salt rarely found on earth’s surface besides places with very arid climate, forms from evaporation of ocean or saline lake waters, halite clastic pebble

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Sample 8 Sample 8 coal Forms from organic matter, carbon composition, changed by increasing heat and pressure, blackish color Organic sedimentary rock clay Sample 9 Sample 9 conglomerate Has presence of pebble sized clasts within a matrix, rounded pebbles due to the water, which weathers it into a rounded shape Clastic sedimentary rock pebble Sample 10 chert Contains silica , nodes in limestone formed from accumulation of siliceous Chemical sedimentary rock boulder