| 41. | Tropical marine conditions continued to persist into the Silurian.
|
| 42. | Another Silurian resident of the Chicago region were cystoids.
|
| 43. | Silurian brachiopods were preserved in the Gate City area at Big Moccasin Gap.
|
| 44. | The same erosional and depositional processes continued on through the ensuing Silurian period.
|
| 45. | Wisconsin was still covered in seawater during the Silurian.
|
| 46. | The sea withdrew from Minnesota for the duration of the ensuing Silurian period.
|
| 47. | The presence of these marine habitats distant from shore persisted into the Silurian.
|
| 48. | Silurian brachiopods and corals fossilized in the Van Horn and El Paso Regions.
|
| 49. | Life in Silurian America was especially diverse around the coral reefs of Indiana.
|
| 50. | The rocks at the site date to the Silurian period of geological time.
|
