210 K M. Kindle — Strdligraphic Relations of the 



of Canandaigua Lake. It is represented in other collections by 

 many specimens from the Genesee shale, from Mt. Morris, New 

 York, and other localities. The form — probably identical with 

 Pseiuloboriiia inornata — is said to have been collected from 

 shales referred to the Hamilton at Livonia, New York. Other 

 material, probably belonging to the same genus but concerning 

 whose specific identity there remains doubt on account of the lack 

 of characteristics in ordinary stem fragments, is said to have 

 come from the Marcellus at Oollingwood, Canada, and 18-Mile 

 Creek, in New York. 



In its typical form the species is — so far as I am aware — char- 

 acteristic of the Genesee shale." 



This plant is an abundant fossil in some parts of the Ilnron 

 shale, although generally found in a fragmentary condition as 

 though transported from a distance. It outnumbers all other 

 fossil plants combined, if we except Sporangites, which are 

 found in the Huron. The testimony of Mr. White that this 

 dominant fossil plant is characteristic of the Genesee shale and 

 is not known to occur above it should have much weight in 

 establishing the Devonian age of the shale and the untenable 

 position of the advocates of the overlap hypothesis. 



The invertebrate fauna of the Huron shale, like that of most 

 black shales, is very sparse indeed. Only one brachiopod with 

 a general distribution has been observed. This is IAngula 

 ligea, which has been found at Rye Beach and other localities 

 where the lower beds of the Huron are exposed. This shell 

 has a recorded range from Hamilton to Portage. The collec- 

 tions of the writer from the type region of the Huron shale 

 include, in addition to Lingulas, a well-preserved Faleoneilo. 

 This shell is closely allied to if not identical with the Hamilton 

 species Paleoneilo tenuistriata. It was collected from a gray 

 band within 5 feet of the base of the Huron as exposed on 

 Huron River. Another molluscan form collected from the 

 Huron at Rye Beach is a Macrocheilus. The surface features 

 are not preserved but the shape of the mould indicates a 

 species closely allied to if not identical with Macrocheilus 

 hamiltonce. 



The Huron and Cleveland shales together afford a rather 

 long list of fishes. But only a small number of these are known 

 elsewhere. Concerning the evidence of this class of fossils it 

 is sufficient to state here that Eastman, Hussakof, and Branson,* 

 the three paleontologists who have in recent years given most 

 attention to the Ohio group fishes, agree in considering these 

 fossils to represent a Devonian horizon. Dr. Eastmanf makes 



* Notes on the Ohio shales and their faunas, University of Missouri, Bull. 

 Science ser., vol. ii, pp. 23-32, pis. 1-3. 

 f Letter to the writer April 10, 1912. 



