For this activity you will need to watch the short video(s) for each sedimentary rock. You have been provided with key characteristics for each sedimentary rock on the page with the sedimentary rock videos. You will need to identify each sedimentary rock by comparing that information with the table below to determine the rock name. Once you have determined the rock name you will need to create an excel table with the following columns and in this order:
Sample Number, Particle size, Composition, Characteristics, and Name. You will be submitting this completed excel table. You need to put the samples in numeric order in the chart.
Each sample is worth 3 points.
You will use the chart below to determine the rock name.
|
Type of Sediment |
Particle Size |
Composition |
Charateristics |
Rock Name |
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|
Clastic |
Coarse grains (> 2 mm) |
Any rock type |
Rounded grains |
Conglomerate |
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Angular grains |
Breccia |
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Fine grains (1/16 to 2 mm) Can be seen with the naked eye |
Quartz, feldspars, iron oxides with minor accessory minerals |
White, tan, brown, reddish; feels like sand paper |
Sandstone |
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Very fine grains <1/16 mm cannot be seen with the naked eye |
Quartz and clay minerals |
Gritty, 1/16-1/256 mm; some grains may be seen with hand lens |
Siltstone |
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Clay sized particles; < 1/256 mm |
Non-fissile |
Claystone |
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Fissile |
Shale |
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Organic |
Varies, generally very fine grained |
Calcite (CaCO3) fizzes with dilute HCI |
Abundant fossils |
Fossiliferous Limestone |
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|
Powdery; shells of microscopic plants and/or animals |
Chalk |
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Coarse to very fine grained |
Calcite (CaCO3) fizzes rapidly with dilute HCI |
Modern day shells, fossils and fossil fragments; loosely cemented |
Coquina |
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|
Varies in size but generally fine grained |
Carbonaceous material |
Plant remains |
Brown, soft, porous |
Peat |
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Brown |
Lignite |
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Black, sooty, blocky |
Bituminous Coal |
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Chemical |
Generally very fine grained |
Calcite (CaCO3) |
Fizzes with dilute HCl |
Medium to coarse grained |
Lithic Limestone |
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Ooids (tiny spheres) |
Oolitic Limestone |
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Banded |
Travertine |
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Halite (NaCI) |
Evaporite, tastes salty |
Rock Salt |
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Gypsum (CaSO4 2H20) |
Evaporite, hardness of 2 |
Gypsum |
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Quartz (SiO2) |
hardness of 7 |
Chert |
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