THE SECTION AT SCHOHARIE, N. V. 373 



pearance above Davis' dam. The color is bluish gray, much 

 darker than that of the Scutella but much lighter than that of 

 the Lower Pentamerus. Like the latter, it is somewhat irregu- 

 lar and roughly lenticular in structure, but less so. The upper 

 layers are easily broken and resemble the Scutella in color as 

 well as in general appearance. They are crinoidal and carry 

 Zapliroitis almost to the top, where they seem to contain little 

 more silica than the lower beds. These upper layers include 

 some thin shaly beds, thus differing from the lower portion, 

 which at most localities is rather massive. The thickness as 

 measured on the schoolhouse hill is approximately 22 feet. 

 Exposures on the east side of the valley are not complete, only 

 the lower portion being shown at most localities. Erosion on 

 that side both before and during the glacial period was much 

 more extensive than on the west side. Good measurements can 

 be obtained on the Schoolhouse hill and on West mountain, 

 both on the west side. 



The Upper Pentamerus is richly fossiliferous ; in some layers 

 only separated valves even of Atrypa and Rhynchonelloid forms 

 can be obtained, but in others the specimens are well preserved 

 and abundant. Some forms are present throughout ; Lcpta^na 

 rhoinboidalis, SchizopJioria niultistriata, Spirifcr concinnus, Mer- 

 istella princeps, Atrypa retiailaris , Wilsonia ventricosa, Steno- 

 chisnia fonnosa, Uncimtbis nobilis, Sicberella psendogaleata ; but 

 beside these are many forms, the writer having obtained Rens- 

 sclcEvia, 2 sp. ; RJiynclioiielloid forms, 4; Meristella, 3 sp.; 

 Spirifer, with OrtJiis, Leptcena, Stropheodojita, Platyceras, Or- 

 thoccras, TrocJwceras, Favosites, Clustctcs, Stroniatopora and Li- 

 chenalia. The Favo sites Jielderbergice is most abundant about 

 midway and is often associated with chert. Where the rock is 

 in proper condition, as at the Brown farm northeast from Scho- 

 harie and above Davis's dam, the Upper Pentamerus affords a 

 series of fossils as interesting and as well preserved as those of 

 the Delthyris. Specimens rarely w^eather free in good condition 

 as they are not siHcified, but the limestone is much more tract- 

 able than the Delthyris and specimens can be broken from the 

 rock, almost as good as those of the Delthyris. 



