374 New York State Museum 



tinuation with or behind the Coeymans. In the Helder- 

 berg area it forms a low terrace below the New Scot- 

 land that is often quite conspicuous in the topography. 

 The upper beds are more impure and grade into the shaly 

 limestone above. Fossils here are even more abundant, 

 especially the smaller ones and bryozoans which are 

 very characteristic. Bryozoans are represented by many 

 genera {Hallopora, Fistulipora, Monotrypa etc.). 

 Erachiopods form a large part of the fauna. The lower 

 beds are marked by the characteristic Bilobites various; 

 among other forms listed are Spirifer macropleura and 

 S. cyclopterus, Spirifer (Delthyris) perlamellosus, Sie- 

 berella coeymanensis, Atrypa reticularis, Anastrophia 

 verneuili, Leptaena rhomb oidalis, Dalmanella perelegans, 

 Rhipidomella oblata, Eatonia medialis, Uncinidus abrup- 

 tus, Strophonella leavenworthana, Nucleospira ventri- 

 cosa, Meristella laevis etc. The trilobite genera Phacops 

 (P. logani) and Dalmanites (Odontochile) are repre- 

 sented. Large crinoid stems (Mariacrinus stolom ferns) 

 are characteristic. Corals are represented by the honey 

 comb coral Favositcs helderbcrgiae and the cup coral 

 Streptelasma (Enter olasma) strictum; and the sponge 

 Hindia inornata occurs. 



The New Scotland limestone (Clarke and Schucher: 

 '99) known in older reports as the "Catskill shaly," 

 "Delthyris shaly" or "Lower shaly" limestone received 

 its name from the town of New Scotland, Albany county. 

 It continues wesfc^rard without interruption into Herki- 

 mer county where it disappears, due to uplift and erosion, 

 and here the Onondaga rests upon the Coeymans. Far- 

 ther west, in Madison county, there is evidence that it 

 reappears, but except for this the Oriskany is the only 

 intervening formation and west of the central part of 



