EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 2'J 



FEET 



not confined to a small part of the deposit, for the same thing is observed at 

 the Petit Portage and Cape Bon Ami, the only two localities in which these 

 limestones have been observed; these are upwards of a mile asunder. The 

 fossils of these calcareous strata are not so numerous as those of the lime- 

 stones at the base of the section. Among them however are fucoids or com- 

 pressed stems of plants, an undetermined species of Chonetes, Leptocoelia 

 concava, L. flabellitcs, Spirifera crispata, with undetermined species of 

 Conularia and Orthoceras ..------.. 200 



Gray or slighly greenish calcareous shales, associated with bands of dark gray. 

 Both are interstratified with layers of arenaceous limestone, which are occa- 

 sionally sufficiently coarse grained to approach the character of a fine con- 

 glomerate. Fossils are somewliat abundant ; in addition to marine plants, 

 which are chiefly confined to long flattened serpentining stems, the species 

 which prevail are two undetermined sjiecies of Lucina, and two of Lingula, 

 Strophomena rhomboidalis, an undetermined Chonetes, Leptocoelia concava, 

 L. flabellites, and Spirifera crispata, with two undetermined species of Ortho- 

 ceras and one of Phacops ....--..-. •^go 



Gray calcareous shales or shaly limestones, interstratified, particularly at the top, 

 with thin beds of purer limestone fit for burning. The organic remains of 

 this part, which do not appear to be abundant, are chiefly obscure serpentining 

 fucoids ; which are accompanied by species of Lingula, Discina, a Conularia 

 resembling C. sowerbyi, and an undetermined species of Pterygotus - - 300 



These strata dip southwest, at an angle of 24°, and are beautifully seen in the cliffs ; 

 which present a vertical naked face nearly 700 feet in hight, on the northeast side of 

 (ias[)e promontory. The lowest limestones, i, constitute the first step in the ascent to the 

 mountains encountered in passing from Cape Rosier to Grande Greve. The second hard 

 calcareous band, 4, forms another step in the same ascent ; it makes also Cape Bon Ami, 

 from which the gray calcareous shales, 5, present a deep slope up to the foot of the gray 

 shaly limestone, 6. These rise in a vertical and sometimes overhanging escarpment, 

 up to the edge of the precipice ; from which the harder beds that form the summit 

 of the above section, slope down into a valley. This valley divides the hills of the 

 promontory into a double range, and maintains its character with some constancy, farther 

 into the interior. 



From this valley, the succeeding members of the series are piled in a second escarp- 

 ment, and constitute the loftier of the two ranges : these strata, as before, dip S.VV. < 24" 

 and are, in ascending order, as follows : feet 



7 Gray nodular shaly limestones, succeeded by gray limestones of a purer nature ; 



these are followed by a second series of beds like the first, on which rest 

 greenish calcareo-arenaceous shales, terminating in a thin layer, which is nearly 

 grass-green. A fossil strongly resembling Fucoides cauda-galli, is common 

 throughout the deposit, and some surfaces are almost completely covered by 

 it ; the only species observed accompanying it was Dalmanites pleuroptyx - 300 



8 Gray limestones fit for burning, in beds of from six to twelve inches thick, some 



of them holding chert at the summit. Fossils abound ; among the species are 

 Fucoides cauda-galli, Favosites gothlandica, F. basaltica, F. cervicornis, two 

 undetermined species of Zaphrentis and one of Fenestella, Orthis oblata, with 

 two or three undetermined species of this genus, Strophomena rhomboidalis, 

 S. becki, S. perplana, with two undetermined species of Strophomena, three 



