Hornblende Granite (NJYbh;11)

State	New Jersey
Name	Hornblende Granite
Geologic age	Middle Proterozoic
Original map label	Ybh
Comments	Byram Intrusive Suite (Middle Proterozoic) (Drake, 1984)
Primary rock type	granite
Secondary rock type	paragneiss
Other rock types	quartz syenite; quartz monzonite; pegmatite; amphibolite
Lithologic constituents	Major Igneous > Plutonic > Granitic > GranitePinkish-gray- to medium-buff-weathering, pinkish-white or light-pinkish-gray, medium- to coarse-grained, gneissoid to indistinctly foliated granite and sparse granite gneiss composed principally of microcline microperthite, quartz, oligoclase, and hornblende. Minor Igneous > Plutonic > Syenitic > Quartz-monzonite Igneous > Plutonic > Syenitic > Quartz-syenite Metamorphic > GneissPinkish-gray- to medium-buff-weathering, pinkish-white or light-pinkish-gray, medium- to coarse-grained, gneissoid to indistinctly foliated granite and sparse granite gneiss composed principally of microcline microperthite, quartz, oligoclase, and hornblende. Incidental Metamorphic > AmphiboliteIncludes small bodies of pegmatite and amphibolite not shown on map Igneous > Plutonic > Granitic > Leucocratic-granitic > PegmatiteIncludes small bodies of pegmatite and amphibolite not shown on map
Map references	Dalton, R. F., Herman, G. C., Monteverde, D. H., Pristas, R. S., Sugarman, P. J., Volkert, R. A., 1999, New Jersey Department Of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1) export file: geology.e00, scale 1:100,000, unit description files: cslegend.pdf and nlegend.pdf, metadata: metast.pdf.
Unit references	Dalton, R. F., Herman, G. C., Monteverde, D. H., Pristas, R. S., Sugarman, P. J., Volkert, R. A., 1999, New Jersey Department Of Environmental Protection, Bedrock Geology and Topographic Base Maps of New Jersey: New Jersey Geological Survey CD Series CD 00-1; ARC/INFO (v. 7.1) export file: geology.e00, scale 1:100,000, unit description files: cslegend.pdf and nlegend.pdf, metadata: metast.pdf. Drake, Avery A. Jr.,Volkert, Richard, A., Monteverde, Donald H., Herman, Gregory C., Houghton,Hugh F., Parker, Ronald A., and Dalton, Richard F., 1996, Bedrock Geologic Map of Northern New Jersey: U.S. Geological Survey Miscellanenous Investigations Map I-2540-A, scale 1 to 100,000, 4 cross sections, 2 sheets, size 56x40; 58x41. [http://pubs.er.usgs.gov/publication/i2540A] Drake, A.A., Jr., 1984, The Reading Prong of New Jersey and eastern Pennsylvania; an appraisal of the rock relations and chemistry of a major Proterozoic terrane in the Appalachians, in Bartholomew, M.J., ed., The Grenville event in the Appalachians and related topics: Geological Society of America Special Paper 194, p. 75-109. Drake, A.A., Jr., Aleinikoff, J.N., and Volkert, R.A., 1991b, The Byram Intrusive Suite of the Reading Prong; age and tectonic environment, in Drake, A.A., Jr., ed., Contributions to New Jersey geology: U.S. Geological Survey Bulletin 1952, p. D1-D14. [http://pubs.er.usgs.gov/publication/b1952]
Geographic coverage	Bergen - Hunterdon - Morris - Passaic - Somerset - Sussex - Warren