GRD00B7S0
I-431
Foid-Bearing Extrusive
Cenozoic › Paleogene › Eocene › Early Eocene › Ypresian
48.6
-
55.8
0
Ritter 154 › Cabinet 20 › Drawer I
-
Trachytic leucite phonolite nice trachytic texture. Emplaced between 54 to 50 Ma.
GSA Bull 52: 1733 (1941)
Highwood Mtns
Montana
Highwood Mtn
Latitude: 47.46°
Longitude: -110.56°
-
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.