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.
