l. Basalt dike (weathered) intruding Grassy Mountain Ignimbrite, overlain by boulder conglomerate and Bonneterre dolomite
2. Grassy Mountain Ignimbrite at the outcrop on Highway 72. Scale is in cm.
Please note: all photos are copyright
2008 Alan Whittington.
Please feel free to use them for academic or other non-profit purposes.
For all other uses, or higher resolution images,
please contact me at whittingtona@missouri.edu
This goes for other pictures on this site too, although why you would want them I don't know...
Also check out pictures from 2003 and 2004 and 2005 and 2006
Page 1: Saturday morning
(Jump to page 1 or page 2; Taum Sauk pictures are on page 3 and page 4)
1 and 2: Key Field Relationships (Highway 72, ~3 mi west of Hwy 67)
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l. Basalt dike (weathered) intruding Grassy Mountain Ignimbrite, overlain by boulder conglomerate and Bonneterre dolomite |
2. Grassy Mountain Ignimbrite at the outcrop on Highway 72. Scale is in cm. |
Grassy Mountain Ignimbrite
3. At the Hwy 67 roadcut, mapped as Grassy Mountain Ignimbrite, two different colored rhyolites are visible ("red" and "blue"). Each apparently contains inclusions of the other (photos 3, 4 and 5). 1. |
4. Red in blue
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5. Blue in Red, Hwy 67.
6-7. "The Big Dike", Silvermines
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8-12. Silvermines Granite, an amphibole ring pluton with enclaves
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13. Rhyolite at Knob Lick (classic viewpoint over Butler Hill Caldera)
14. Enclave in Knob Lick Granite, at the quarry. Note fine rim to enclave, rimmed by unusually coarse granite.
15. Epidote in Knob Lick Granite, at the quarry.
(Jump to page 1 or page 2; Taum Sauk pictures are on page 3 and page 4)
