Field Notebook: Maine, New Jersey, Vermont 1923
Page 106
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Transcription
To Millburn via Gregory and Wyoming Avenues- Gap in First Mountain- Corresponding gap in Second Mountain filled by Moraine. These gaps mark pre-glacial course of the upper Passaic and Rockaway Rivers. To Springfield- Church of Revolutionary fame. - To Union, Roselle, Wheatsheaf and Woodbridge. Perth Amboy for night. Note on Trias of New Jersey Triassic formation in New Jersey consists of a great thick- ess of red shale, arkosic sandstone, (some beds conglomerat.) dark colored argillite, and three thick sheets of interbedded extrusive basalt. Each of the latter was formed by several flows closely following each other. Near the base of the series is an intrusive sill of diabase which forms the Palisades along the Hudson. The sediments were mainly fluvatile, accumulated in an intermountain valley, under arid conditions. From the top down- ward they have been grouped into the (a) Brunswick shales (b) Lockatong argillite (c) Stockton sandstone. Along the northwest border are local deposits of very coarse conglomerates- the alluvial fans of snow-fed rivers debouching from canyons in the mountains. In the northeastern part of the State only the Brunswick beds are recognized. The Stockton and Lockatong beds are best seen near the Delaware, where profound faulting repeats the series twice. The igneous rocks form conspicuous ridges, the crests of which form a part of the dissected Schooley Mountain penesplain. The sedimentary rocks underlie rolling lowlands, remnants of two base-levels, developed in Tertiary time, the lower of which (Somerville peneplain) was widely covered with stream deposits in early Pleistocene. These have been since almost entirely removed and the present dissection accomplished. THURSDAY Note on Cretaceous of New Jersey In New Jersey the Cretaceous consists of the Manasquan marl 25 feet Ranococas group Vincentown sand 25-70 feet Hornerstown marl 39 feet Mohnmouth group Redbank sand and Tinton sand member 0-100 " Navesink marl 25-40 feet Mount Laurel sand 5-60 " Matawan group Wenonah sand 20-35 feet Marshalltown formation 30-35 feet Englishtown sand 20-100 " Woodbury clay 50 feet Merchantville clay 63 feet