Geological Equivalents. 137 



many of which have fourteen or fifteen prominent rings each. 

 They are about half an inch in length. Syringopora ramulosa. 



III. LOWER SECONDARY. 

 Second graywacke. 



Coal slate and grit. Filices (ferns,) Equisetaceaj (rush-like,) Ly- 

 copodiacese (ground-pine-like,) Cycad^ (fan-palms,) Palmse 

 (palm-like,) Cannae, (reed-like,) Cacti, (prickly-pear-like.)* 



Rubble and slaty wacke. Encrinus dicyclus, Pentacrinites tu- 

 berculatus? Orthocera conica, 'Cancer triloboides, Asaphus 

 caudatus, Spirifer Walcottii, Spirifer (not described,) Bellero- 

 phon tenuifascia? Coscinopora macropora, (taken from retipora,) 

 Gorgonia bacillaris. 



Millstone grit. No organized remains discovered. 



JYew red and gray sandstone, Saliferous. Lingula mytiloides, 

 Encrinus giganteus. 



IV. UPPER SECONDARY. 

 Oolitic rocks. 



Shell grit, Calcareous grit. Bellerophon (two species, not ascer- 

 tained,) Terebratula perovalis, T. ovoides, Spirifer attenuatus? 

 S. trigonalis? 



Coral rag. Encrinus interruptus, E. teretiformis, Orthocera cir- 

 cularis, Madrepora limbata, Astrea stylophora, A. porosa, Sar- 

 cinula auleticon, S. microphthalma, Diploctenium pluma, Lith- 

 odendron cespitosum, Columnaria alveolata, (most common of 

 the petrifactions over the Pucker Street cavern, on the Helder- 

 berg,) Catenipora auleticon, Cyathophyllum hypocrateriformis, 

 Gorgonia infundibuliformis, Asaphus Hausraannii ; Terebratula 



■ spiriferoides. Nobis. Fine specimens of both are found along 

 the south shore of Lake Erie, in the ledge ; particularly, near 

 -Eighteen-mile creek. 



V. TERTIARY. 



Clay, plastic and marly. Charred wood or lignite, embracing 

 small masses of. amber, and large quantities of iron pyrites, 

 iron stones and bog ore. Placatula pectinoides found in the 

 pyrites. In a kind of green calcareous sand, in New Jersey, 

 numerous organic relics are found, for which I refer to Dr. Mor- 



* The figure published in Vol. XX, p. 122, of this Journal, will probably be 

 called a vegetable fossil, as I there stated. As a " similar" one had never been pub' 

 lished, and as nothing resembling the curvilinear processes, which appear like the 

 rays of the dorsal and ventral fins of some species of the eel, and of other fish, had 

 been observed, the subject demands further examination. The original specimen 

 will soon be examined by M. Brongniart, whose decision will be final. 



Vol. XXL— No. L 18 



