The Waldron locality of the Niagara group, which has proved so prolific in species, and so abundant in the individuals of nearly all of them, was discovered in 1860 by Prof. David Christy, of Cincinnati, and the information was communicated to Professor James Hall in the Autumn of that year. The Silurian seabed was generally shallow and the bottom extremely uneven. In Indiana these shale beds were probably deposited in a wide depression of the ocean bed, similar to that of Western New York, while to the northward the area was a more shallow sea. We have a less accurate knowledge of the physical conditions prevailing to the south and southwest of the region described; but it would appear, from what we know of the distribution of the fossils, that there were similar areas of depression with a most abundant fauna, while the intermediate shallower areas are marked by the presence of calcareous deposits, with a moderate development of a somewhat distinct fauna featuring coral, crinoids, and brachiopods.
Last Modified 04/12/2012
|Return to Index||Main Crinoid Page||Questions?|