Usage:
North Shore Group (MN)
/North Shore Volcanic Group (MN*)
[A group name combines a geographic name with the term "group," and no lithic designation is included (ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Subunits:
(alphabetical) --all in MN: Baptism River Lava, Bell Harbor Lava, /Breakwater Trachybasalt [, Brule River Rhyolite Flow, /Brule River Basalt [now Naniboujou Basalt(?) -written in pencil on my copy], Croftville Basalt, Deronda Bay Andesite, Devil Track Felsite, Good Harbor Bay Andesite, Gooseberry River Basalt, Grand Marais Rhyolite, Grand Portage Basalt, Hovland Lava, Kimball Creek Felsite, Lakeside Lava, Lakewood Basalt, /Larsmont Ophitic Basalt [superfluous compound term], Leif Ericson Park Lava, Lutsen Basalt, /Manitou Trachybasalt, Marr Island Lava, Palisade Rhyolite, Schroeder Basalt, Sucker River Basalt, Terrace Point Basalt, Two Harbors Basalt.
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Not stated. Occurs in Lake and Cook Cos., northeastern MN (Grout and others, 1959).
AAPG geologic province:
Lake Superior region*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).