| Different views of a brachiopod called Idiostrophia valderi from the middle Ordovician Antelope Valley Limestone of the Beatty bioherm. Actual size of specimen is 6 millimeters long. Scanned from a USGS professional paper, a Public Domain document. |
| Different views of a brachiopod called Idiostrophia valderi from the middle Ordovician Antelope Valley Limestone of the Beatty bioherm. Actual size of specimen is 6 millimeters long. Scanned from a USGS professional paper, a Public Domain document. |