Limestone (rugose coral) |
|
Limestone (fossilerous)Biogenous sedimentary rock.This sample of Devonian-age limestone displays a large rugose coral (horn coral) and crinoid column disks (fragments) in a fine limestone matrix. This sample comes from the Falls of the Ohio, Devonian reef area exposed in the Ohio River bed in Louisville, Kentucky. |
| https://gotbooks.miracosta.edu/rocks/sedimentary/40.html | 2/2/2021 |