Nice Brachiopods Plate. The Devonian faunas known in Kentucky represent middle and upper Devonian time, and correspond in age with a part of the Onondaga, Hamilton, Tully, and Genesee divisions of the New York section as shown in the table given below. It seems almost certain that lower Devonian seas submerged portions of western Kentucky, for sediments and faunas of Helderberg and Oriskany time are known to the south in Tennessee and to the north and west in Illinois and Missouri. However, if these early Devonian seas did spread over parts of western Kentucky, the sediments and fossils that were deposited in them were all removed by erosion before the middle Devonian and younger strata that are now found in the region were laid down. It. is possible that patches of lower Devonian sediments and fossils may still be present in western Kentucky, but if they are, such places are covered and concealed by younger strata.