GRD00B0S0
I-424
Foid-Bearing Extrusive
Cenozoic › Paleogene › Eocene › Early Eocene › Ypresian
48.6
-
55.8
0
Ritter 154 › Cabinet 16 › Drawer N
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Emplaced between 54 to 50 Ma. Original description: pseudoleucitite mafic phonolite. Nice euhedral hornblende phenocrysts.
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Highwood Mtns
Montana
Highwood Mtn
Latitude: 47.46°
Longitude: -110.56°
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N/A
N/A
N/A
Larsen_GSABulletin_1941
Larsen, E.S. 1941. Igneous rocks of the Highwood Mountains, Montana; Part II, The extrusive rocks: Bulletin of the Geological Society of America, vol. 52, pg. 1733-1752.