Brewster, Town of Southeast, Putnam Co., New York, USA
|Latitude & Longitude (WGS84):||41° 23' North , 73° 37' West|
|Latitude & Longitude (decimal):||41.38333,-73.61667|
|Köppen climate type:||Cfa : Humid subtropical climate|
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87 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Middle Ordovician - Early Cambrian|
458.4 - 541 Ma
|Manhattan Formation, undivided|
Age: Paleozoic (458.4 - 541 Ma)
Stratigraphic Name: Manhattan Formation
Description: Pelitic schists, amphibolite; Units ?Omb, ?Omc, and ?Omd may be Cambrian eugeosynclinal rocks thrust upon Oma; ?Omd - sillimanite-garnet-muscovite-biotite-plagioclase-quartz gneiss; ?Omc - sillimanite-garnet-muscovite-biotite-quartz-plagioclase schistose gneiss, sillimanite nodules, local quartz-rich layers; ?Omb - discontinous unit of amphibolite and ?Omc-type schist.
Comments: part of Trenton Group and Metamorphic Equivalents up to 8000 ft. (2400 m). All units (?Omb - ?Omd) are mapped under Om in digital map. Only unit Oma is separated out, so I separated it out of this description. Unit is also mentioned under Eugeosynclinal (Allochthonous) Sequence; uses same symbol and color. Age change and second unit description from USGS Lexicon website (ref. NY046) and reference NY004: Manhattan Schist member A replaced by Walloomsac Formation (not new) based on work by Jackson and Hall (1982), Hall (in press), and A.A. Drake (1990, pers. commun.). In addition, L.M. Hall (1985?, pers. commun.) determined that member B of the Manhattan Schist is part of member C and thus recommended the abandonment of member B (Baskerville, 1992) .
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
1000 - 1600 Ma
|Mesoproterozoic crystalline metamorphic rocks|
Age: Mesoproterozoic (1000 - 1600 Ma)
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.