USGS Visual Identifier
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Geologic Unit: Blue Hill

Usage:
Blue Hill Granite Porphyry (MA*)

Age:
Ordovician, Late*
Silurian, Early*
Geologic Province:
New England province*

Areal Extent:
MA*


Type Locality:
Type area: Blue Hills Range, eastern MA (Crosby, 1880).

Unit Name History:
[Please note: only the Goldsmith and others (1982), Zen and others (1983), and Wones and Goldsmith (1991) references include synopses here. The remaining references have yet to be added from the GNC index card files. Until then, feel free to contact us if you would like complete bibliographic citations.]
Named Blue Hill Granite (Crosby, 1880).
Revised to Blue Hill Granite Porphyry (Emerson, 1917).
Age modified (LaForge, 1932).
Misnamed Blue Hills Porphyry (Dennen, 1951) [just Hill].
Age discussed; Isotopic dating (Chute, 1966).
Age modified (Chute, 1969).
Isotopic dating (Bottino and others, 1970).
Age modified; Isotopic dating (Zartman and Marvin, 1971).
Age modified (Zartman, 1977).
Proposed abandonment (Billings, 1982).
Age modified, misused as Blue Hills Granite Porphyry (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Misused as Blue Hills Granite Porphyry; Overview (Goldsmith, 1991; Wones and Goldsmith, 1991).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).






U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
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Last modified: 15-Jan-2013