Mesozoic and Ccunozoic Geology and Paloiontology. 9 



Ornithoid ichnites ai'e 0. giganteus, 0. tuberosus, 0. expansus, 0. ciine- 

 atus, 0. parviclus, 0. ingens, 0. elegans, 0. deani, 0. tenuis, 0. maa^o- 

 dactylus, 0. divaricatiis, 0. isodactylus^ 0. delicatulus, 0. minimus^ 0. 

 gracilior, and 0. tetradactylus. He afterward, before the Association 

 of American Geoloj^ists and Naturalists, described some species under 

 these names, which he subsequently referred to other genera. 



In J 842, Prof. J. G. Percival* described the existence of these rocks 

 in two places in Connecticut, as follows: 



The larger secondary formation extends from Morris Cove, on the 

 east side of New Haven Harbor, on the south, to the north end of North- 

 field village, in Mass., on the north, a distance of nearly 80 miles. Its 

 greatest width, near the central part of the basin, exceeds 20 miles. 

 This basin is entirely surrounded by Primary rocks, except at New 

 Haven Harbor, where, however, Primary rocks form the two points on 

 the opposite sides of the basin. The smaller secondary formation ex- 

 tends 6 to 7 miles from south to north, and at its widest point scarcely 

 exceeds two miles in breadth, and is about equally included in the 

 towns of Woodbury and Southbur3^ It forms a small isolated tract, 

 nearly in the center of that part of the Western Primary, within the 

 limits of the State, and nearly 15 miles west of the larger secondarj" 

 formation. The rocks of both these formations consist of Red Sand- 

 stones, Conglomerates and Shales, and the physical characters and 

 organic remains indicate a peculiar relation to the New Red Sandstone 

 of Europe. 



In 1843, Prof. W. W. Mather f described these rocks in the State of 

 New York, as follows : 



The New Red Sandstone occupies that portion of Rockland count}^ 

 from Grassy point along the base of the Highlands to New Jersey, and 

 eastward to the Hudson, but a portion of its area is covered over by 

 trap rocks. It has also been found in a small area in Richmond 

 county. In color, it varies from chocolate brown, through brick-red 

 and gray to white; in texture, it varies from pebbly conglomerate, 

 through common sandstone, fissile and micaceous sandstone, to shale; 

 and in composition, from perfectly siliceous to an argillo-calcareous 

 marl. Where the trappean rocks have cut through the strata, or have 

 spread lateral!}' between them, their texture and appearance are much 

 modified, and appear to have been subjected to the action of heat, 

 which has partly melted them, or rendered them more compact and 

 hard, like a hard-burnt brick, or has made them metalliferous, 



* Geo. of Conn. t Geo. of N. Y. 



