. Guide leaflet. the Fort Lee Rutiodon, pages 18-19, has been foundnear New York City. Fossil fishes and a small crustacean, Estheriaovata, have also been found. The fossil remains indicate Triassic age,the initial period of the Mesozoic Era, sometimes called the Age ofReptiles. Three successive lava flows which were extruded during the deposi-tion of the Newark beds have been subsequently faulted, flexed, andt ilted into their present position. Since that event erosion has removed agreat thickness of sedimentary rocks and the upturned edges of the lavasheets are now exposed. The First and Sec
. Guide leaflet. the Fort Lee Rutiodon, pages 18-19, has been foundnear New York City. Fossil fishes and a small crustacean, Estheriaovata, have also been found. The fossil remains indicate Triassic age,the initial period of the Mesozoic Era, sometimes called the Age ofReptiles. Three successive lava flows which were extruded during the deposi-tion of the Newark beds have been subsequently faulted, flexed, andt ilted into their present position. Since that event erosion has removed agreat thickness of sedimentary rocks and the upturned edges of the lavasheets are now exposed. The First and Second Watchung Mountainsand Hook Mountain represent these three basaltic flows. Hie Mountain, is about 000 feel thick; Second Mountain 800 feel, andHook Mountain 300 feet. About GOO feet of red sandstone and shaleseparate the first and second, and 1500 feet the second and third. RedTriassic sandstone and shale are also found above and below thesevolcanic rocks. GEOLOGY OF NEW YOhK CITY AND YICIXITY 21. Palisades of the Hudson opposite Spuyten Duyvil, N. Y. The Palisade diabase is a great sheet of igneous rock, from 350 to1000 feet thick, which was intruded among the lower strata of the New-ark group. It extends from Staten Island northward along the westbank of the Hudson River to Haverstraw. At its southern exposedextremity it is practically at sea level, while at the north it is 700 feethigher. Throughout most of its extent it presents an escarpment ofhigh cliffs with vertical columns of rock which were developed duringthe cooling stage and which suggest the name Palisades, page 19. CRETACEOUS PEROID Stratified rocks which represent the closing stage of the Age ofReptiles rest unconformably upon the Newark group in New Jerseyand upon the crystalline basal complex in Staten Island and Long Is-land. Except for a few exposures along the north coast and the interiorof Long Island, the Cretaceous sediments are hidden by glacial deposits ofPleistocene age. Their presence
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