GEOLOGY 1008
NAME:
EXERCISE 4 - SEDIMENTARY ROCKS
Step 1: Identify the composition of the rock using the instructions provided in the lab book. You should use a hand lens to examine the rocks; the mineral grains will be much easier to see. Use a drop of acid to check for the presence of calcite (please wipe the acid off of the sample).
Step 2: Determine if the rock is clastic (detrital) or non-clastic (chemical or biochemical). If the rock is clastic, use the diagrams on p. 59 to describe the sediment characteristics.
Step 3: Determine the rock's environment of deposition (use the diagram on p. 60, the table on p. 61, and the descriptions on p. 67-69).
Step 4: Determine the rock's identity. The following rock samples are provided: conglomerate, breccia, arkose sandstone (or greywacke), quartz sandstone, shale, clastic limestone, micritic limestone, oolitic limestone, coquina limestone, fossiliferous limestone, chalk limestone, dolostone, chert, coal, and rock gypsum.
| ROCK # | DESCRIPTION may include: clast shape & size, sorting (p. 58-59); mineral composition (p. 65); & fossils |
CLASTIC (detrital)/NON-CLASTIC (chemical or biochemical) (p. 62) |
ENVIRONMENT OF DEPOSITION (p. 60-61) | NAME (use the table on p. 66) |
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| S16 |
Fossils are found only in sedimentary rocks (with very few exceptions), why?