TYPICAL SHERBURNE 425 



about 63 feet above the toj^ of the Hamilton, carndng a few specimens of 

 the following species : 



Buchiola speciosa Hall r 



Leptodesma rogersi Hall r 



Coleolus aciculus f c 



Orthoceras cf. suhulatum Hall r 



(roniatites cf. discoideus Hall c 



This appears to be a wedge of the more fossiliferous western shales en- 

 tering the unfossiliferous Sherburne sands and shales. The relationship 

 with the fossiliferous Tully, Genesee, and Naples to the westward is 

 shown on the following diagram: 



FiGTTRE 1. — Diapram sl\otvincj relationships of Sherbuiiie Sands (S) to Genesee SJiales (G) 

 and Tnllij Limestone (T) in the vicinity of Sherhurne Village 



Typically marine fossils are absent from the typical Sherburne sands 

 and shales except for the wedges of ^N'aples shales aboye referred to., but 

 Dr. John M. Clarke has illustrated a fragment of this rock which, besides 

 showing the natural relief molds of longitudinal drag-furrows and the 

 characteristic Fucoides grapliica, also incloses a stranded goniatite shell 

 {Mantle over as). Plant remains are, however, not uncommon in the 

 Sherburne sandstones. These are probably for the most part stipes of 

 ferns or fernlike plants and they are represented chiefly by impressions, 

 often more or less iron-stained. Yanuxem says of them : "They have the 

 appearance of narrow leaf-grasses, broken into fragments, and are in- 

 variably of a brownish color."^ These plant remains are always found 

 on the bedding planes, where they appear to have been stranded, they 

 having been brought to their resting place from other localities. That 

 they did not grow in situ is shown by the fact that they are never up- 

 right, penetrating the la3^ers of sandstone at right angles to the bedding- 

 plane, as would be the case were the sand and mud deposited around the 

 standing stems of reeds or other aqueous plants. So far as can be judged 



T Report of the Third District, 1842, p. 173. 



