[36] See Annals of N. Y. Lyceum, vol. i. page 185.
Animal remains are contained in every part of the rock; besides several genera of trilobites, we have several species of orthocera. Encrinites and Fungites—Nautili—Terebratulæ and Producti, are quite common. The favosites here are sometimes six inches in diameter, and in such numerous columns, as to have induced the late worthy proprietor of this interesting spot, Mr. J. Sherman, to consider them as analogous in structure to the basaltic columns of Staffa and the Giant's Causeway; he therefore maintains the extravagant theory that these columns are nothing more than gigantic favosites.[37] We visited this famous locality of trilobites not long since, and were almost as much delighted with the sublimity and grandeur of the cataract, and the picturesque and romantic character of the glen, as with the reliques of olden times, which are scattered here in such profusion.
[37] See a Description of Trenton Falls, by John Sherman, p. 17.
The genus Isotelus, derived from Ἱσος, equal, and τελος, extremity, is thus characterized by Dr. Dekay.
Body oval often contracted, not unfrequently extended.
Head or buckler large and rounded, equalling the tail in size, but with two oculiform tubercles.
Abdomen with eight articulations.
Frontal process beneath, with two semilunar terminations.
Post abdomen or tail, broad, expanded with indistinct divisions, as large as the buckler.
Longitudinal lobes very distinct.