1202 



NEW YORK STATE MUSEUM 



Several of the species mentioned in the Glenerie list have been 

 found in the various other localities about Rondout but no 

 record has been made of them. 



This Glenerie fauna is quite as large as that of the Becraft 

 mountain Oriskany, described by Clarke [1900], but differs from 

 it in some important respects, of which the most notable is the 

 larger proportion of New Scotland species present in the Glen- 

 erie beds. No comparison can yet be made between the pelecy- 

 pods and bryozoans of the two faunas, as these organisms in 

 the Glenerie collections have not been identified. 



The large percentage of New Scotland species (26 out of a 

 total of 94) in the Glenerie Oriskany emphasizes the close affin- 

 ities between the Helderbergian and Oriskanian faunas. Indeed 

 the Glenerie fauna and the beds containing it present essentially 

 a recurrence of the conditions of sedimentation and of the fauna 

 of the New Scotland beds during Oriskany time. The true 

 Oriskany element of the Glenerie fauna (represented by such 

 species as Edriocrinus sacculus, Khipidomella 

 musculosa, Leptaena ventr icosa , Leptostro- 

 phia magnifica and L . m a g n i v e n t e r . H i p - 

 parionyx proximus, the large Camarotoechias, 

 Spirifer arenosus and S . m u r c h i s o n i . Rens- 

 selaeria ovoides, Megalanteris ovalis, Beachia 

 suessana, Aetinopteria arenaria, etc.) is con- 

 sidered by us to have been derived by migration from a contem- 

 poraneous fauna which occupied an adjoining basin or trough 

 farther to the westward, under somewhat different biouomic con- 

 ditions. Instead of considering the eastern calcareous beds as 

 Lower and the western arenaceous beds of the Hipparionyx fauna 

 as Upper Oriskany, as suggested by Schuchert, we are disposed to 

 follow Clarke in regarding these two types as presenting two 

 distinct contemporaneous facies of the Oriskany. At no point 

 have these two facies with their distinct faunas been found 

 superimposed in a single section, nor have they been found in 

 close proximity to each other. We do not include in this sug- 

 gestion of contemporaneity the Oriskany-Onondaga fauna of 

 Ontario, Canada, whicn is undoubtedly of later age. The prea- 



