| Extinct, solitary streptelasma rugose corals from the Middle Ordovician Johnson Spring Formation, Inyo County, California. Top two are Grewinghia whitei; bottom specimen is Bracheyelasma bassleri. Image courtesy a specific scientific publication. |
| Extinct, solitary streptelasma rugose corals from the Middle Ordovician Johnson Spring Formation, Inyo County, California. Top two are Grewinghia whitei; bottom specimen is Bracheyelasma bassleri. Image courtesy a specific scientific publication. |