GRD00B8S0
I-432
Micaceous Extrusive
Cenozoic › Paleogene › Eocene › Early Eocene › Ypresian
48.6
-
55.8
0
Ritter 154 › Cabinet 16 › Drawer N
-
Phlogopite, olivine? bearing phonolite. Emplaced between 54 to 50 Ma. Original description: Ultramafic?? with serp. olivine.
GSA Bull 52: 1733 (1941)
Highwood Mtns
Montana
Highwood Mtn
Latitude: 47.46°
Longitude: -110.56°