31. Various Silurian and Devonian sedimentary formations exist in the area as well. 32. A young Silurian orders Baker infected with a virus before he is released. 33. This happened at the end of the Ordovician and during the early Silurian . 34. This story introduces the aquatic cousins of the Silurians , the Sea Devils. 35. Casey is underlaid by rocks from the Silurian period. 36. Like Inishbofin, Inishark is composed almost entirely of Silurian slates and shales. 37. Thus, the first insects probably appeared earlier, in the Silurian period. 38. They lived in shallow seas during the Early Ordovician through the Early Silurian . 39. The ship, however, registers no Silurian life forms left on board. 40. Eisenack's work extended from the Silurian into the Ordovician and Cambrian.
