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By Charles A. Baskerville, Nicholas K. Coch, Sidney Horenstein, Martin Prinz, John H. Puffer, Geneva R. Roberts-Dolgin, Dennis Weiss

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Published via the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

This box journey allows delegates attending the Twenty-eighth foreign Geological Congress to spend numerous days within the greatest urban within the usa. neighborhood geologists have designed day-long box journeys to acquaint members with the complicated geology of the recent York urban metropolitan zone. The papers incorporated during this e-book will function publications to the deliberate journeys yet won't unavoidably persist with the order within which the journeys can be scheduled.

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The Green Pond is about 400 m thick. Alkalic Intrusives. The Proterozoic and Cambrian rocks of northern New Jersey have been intruded by a network of Ordovician alkalic diabase dikes (Hull and others, 1988). The diabase dikes are typically less than 2 m thick and consist of andesine, labradorite, augite, quartz, and titanomagnetite. Most of these dikes have been mapped previously as Triassic in age, but they can be easily distinguished from Mesozoic diabase in the field by large, ellipsoidal pyrite poikiloblasts in their chilled margins.

The Manhattan Schist member A, described by Hall (1968a, b), is an autochthonous Ordovician unit unconformably overlying the Cambrian and Ordovician Inwood Marble. The Manhattan Schist member C (Hall 1968a, b) is an allochthonous Cambrian schist unit in thrust contact with the underlying Manhattan Schist member A. This thrust contact relation can be seen only in a couple of mainline railroad cuts in the Bronx, which, unfortunately, are not readily accessible. Merrill and others (1902) also included the schists, gneisses, granites, and amphibolites found in the east Bronx within the Manhattan Schist.

Some iron and potassium, however, may have been mobilized during anatexis in a granulite facies environment. Since the FeO/MgO ratios of the silicate components of the gneiss were presumably decreasing in response to increasing temperatures and pressures during metamorphism and since water and potassium is generally released during prograde metamorphism, some iron and potassium may have been released into aqueous fluids. These fluids may have migrated along thermal and pressure gradients toward sites of iron and pegmatite accumulation and may be responsible for some of the magnetite ore deposits so common in the Highlands (Puffer, 1980).

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