USGS - science for a changing world

Mineral Resources On-Line Spatial Data

Precambrian Z rocks of Islesboro

Precambrian Z rocks of Islesboro
StateMaine
NamePrecambrian Z rocks of Islesboro
Geologic agePrecambrian Z
Original map labelZi
CommentsIslesboro Formation is of Late Proterozoic age. Consists of interbedded pelite, siltstone and sandstone, limestone and dolomite, conglomerate, rhyolite, and basalt. D.B. Stewart (1990, oral commun.) considers Islesboro to be distal facies of North Haven Greenstone, Ellsworth Schist and schist at Columbia Falls (eastern coastal ME). (ME072) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Primary rock typemudstone
Secondary rock typesandstone
Other rock typessiltstone, limestone; dolostone (dolomite); conglomerate; rhyolite; basalt
Lithologic constituents
Minor
Sedimentary > Carbonate > DolostoneGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Sedimentary > Carbonate > LimestoneGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > ConglomerateGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > SiltstoneGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > SandstoneGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > MudstoneGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Incidental
Igneous > Volcanic > Mafic-volcanic > BasaltGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Igneous > Volcanic > Felsic-volcanic > RhyoliteGS - Greenschist facies AA - Low rank amphibolite facies Protolith Q - Interbedded pelite and sandstone
Map references
Digital bedrock data downloaded from Maine Office of GIS in September 2005 from http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock Bedrock units table (publication date 11/15/2002) downloaded from same site. Permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006.
Unit references
Osberg, P. H., Hussey, A.M., and Boone, G. M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Dept. of Conserv., scale 1:500,000.
Rankin, D.W. (editor), Chiarenzelli, J.R., Drake, A.A., Jr., Goldsmith, Richard, Hall, L.M., Hinze, W.J., Isachsen, Y.W., Lidiak, E.G., McLelland, James, Mosher, Sharon, Ratcliffe, N.M., Secor, D.T., Jr. and Whitney, P.R., 1993, Proterozoic rocks east and southeast of the Grenville Front, IN Reed, J.C., Jr., and others, eds., Precambrian; conterminous U.S.: Geological Society of America, The Geology of North America, The Decade of North American Geology (DNAG), v. C-2, p. 335-461.
USGS Geologic Names Lexicon (GEOLEX)
Geographic coverageHancock - Knox - Waldo

Show this information as [XML] - [JSON]

AccessibilityFOIAPrivacyPolicies and Notices

Take Pride in America logoUSA.gov logoU.S. Department of the Interior | U.S. Geological Survey
URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MEZi;0
Page Contact Information: Peter Schweitzer