6o NEW YORK STATE MUSEUM 



bed of soft shale at the mouth of Gibson's glen contain some 

 beautifully preserved fossils, mostly small specimens of Manti- 

 coceras rhynchostoma Clarke and similar concretions 

 occur elsewhere in this horizon but by far the larger part of the 

 fossils collected from the Gardeau beds have been found in layers 

 of light blue or olive soft shale, generally but a few inches thick. 

 But few of them are conveniently accessible to collectors, but the 

 lower one may be reached at the mouth of Wolf creek and others 

 a mile farther up the ravine. 



At the top of the Lower Portage fall, a 10 inch layer immediately 

 beneath Table rock is quite fossiliferous and a thinner layer 10 feet 

 lower contains a few lamellibranchs and Manticoceras 

 rhynchostoma occurs though very rarely, just above the 

 12 inch sandstone at the top of the Flume. 



In 1906 a fall of rock from 60 feet up in the cliff on the east 

 side 40 rods above the Lower fall, brought down a part of an 

 extensive bed of plant remains in which were many fragments of 

 lepidodendron. A thin layer at water level half way between the 

 Middle and Upper falls has afforded a number of fine specimens 

 of Manticoceras oxy Clarke and other species, while similar 

 layers occur a few feet higher. 



Although no brachiopods have been found in these beds in the 

 gorge it is quite possible that some of the considerable number 

 common in this horizon in the Naples valley may have extended as 

 far west as this and their remains be buried in the inaccessible strata 

 of the cliffs. A thin calcareous seam exposed by the roadside on 

 Quarry hill 1 mile south of Nunda and stratigraphically near the 

 top of the Gardeau beds, is composed of crinoid stems and frag- 

 ments of brachiopods, and a calcareous sandstone 3 inches thick 

 exposed by the side of the river road 2 miles north of River Road 

 Forks and in the lower part of this formation contains Ambocoelia 

 in large numbers, also Chonetes and fragments of Leptostrophia less 

 abundantly, all exceedingly small. 



The following is a list of the more common fossils in the Gardeau 

 beds on these quadrangles : 



Entomis serratostriata Sandberger Bactrites aciculum (Hall) 



E. variostriata Clarke Styliolina fissurella (Hall) 



Manticoceras pattersoni (Hall) Phragmostoma natator Hall 



M. oxy Clarke Loxonema multiplicatum Clarke 



M. rhynchostoma Clarke Palaeotrochus praecursor Clarke 



Tornoceras uniangulare (Conrad) Lunulicardium bickense Hohapfel 



Orthoceras pacator Hall Honeoyea erinacea Clarke 



