LAB EXERCISES Using the sedimentary structures provided in the lab, fill in the
ID: 287082 • Letter: L
Question
LAB EXERCISES Using the sedimentary structures provided in the lab, fill in the table below. For each sample, identify the sedimentary rock. Use the illustrations in this lab to identify the sedimentary structure. Note that some lab specimens may have more than one sedimentary structure, such as both laminations and burrows, or bur- rows and ripple marks. Use the Summary page to determine whether the sedimentary structure formed through inorganic processes or biogenic processes. If there is more than one sedimentary structure, there may be more than one answer. Finally, using what you learned in this lab, try to interpret the environment in which the sedimentary structure(s) formed If the structure forms in moving wind or water, indicate that and interpret whether wave or current motion may have been involved. The environment of deposition may have been a river or beach. If the structure forms as mud dries, the environ ment of deposition may have been a lake or tidal flat. Sample Rock Type Name of Sedimentary Structure Inorganic or Biogenic? Interpret the environment of depositionExplanation / Answer
1. Yes it indicates the top bottom.
Rock type is mud rock
Structure is mud crack
Inorganic in nature.
4. Yes it indicates the top bottom structure.
Rock type musstone
Structure is rain print
Inorganic in nature.
5.no the up direction can't be determined by this structure
This is a graded bedding probably normal graded bedding .
Inorganic in nature.
6. Rock type is sandstone
Structure is ripple marks with truncated top amd asymptotic bottom.
Inorganic in nature.
8. If the top is north then the paleocurrent direction eill be north west to south east.
The structure is groove mark.
Inorganic or organic in nature
9.yes it indicates the top bottom direction
Rock type mudstone
Structure is syneresis mudcrack under sub aquous condition .
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