Fossilferous sandstone
Biogenous and lithogenous sedimentary rock.
This sample is a chunk of graywacke (sandy mudstone) that contains a mix of shell fossils and casts of gastropods (snails), oyster shell, clam shell, mussel shell, and wood fragment. It has been partly bioturbated. It was probably storm-related sediments deposited in a tidal channel or submarine channel setting. This sample came from the Eocene-age Delmar Formation, Del Mar, California. |
| https://gotbooks.miracosta.edu/rocks/sedimentary/41.html |
2/2/2021 |
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