St. Francois Mountains, April 2006

Igneous and Metamorphic Geology Field Trip

Please note: all photos are copyright 2006 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

Page 1: Saturday (Sunday is on page 2, People are on page 3)

 

1 and 2: Key Field Relationships

l. Basalt dike intruding Grassy Mountain Ignimbrite, with Great Unconformity at the top of the ouitcrop

2. Knob Lick amphibole-granite ring pluton intruding banded rhyolite

Grassy Mountain Ignimbrite

3. Intrusive (?) contact within the Grassy Mountain Ignimbrite (note right-dipping banfing in left unit, apparent chilled margin around the scale, and non-banded unit to right). Hwy 67 S of Frederickton.

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4. Intrusive (?) contact within the Grassy Mountain Ignimbrite (note steeply dipping pink unit; contacts are also sheared - could this be an altered mylonite?)

5. Cambrian alluvial fan deposit, Hwy 72.

6-9. Tiemann's Shut-Ins. Tonalitic enclaves in Silvermines ring pluton, intruded by pink aplite dikes

10-13.Pilot Knob

10.The Lower Cut

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11. The Upper Cut

12.Ashfall imprints (?) in Precambrian Banded Iron Formation, Pilot Knob

13.Sunset, Pilot Knob

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