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Purcell Sill, layer-jumping
Source info:
| Author: | |
|---|---|
| Date: | 2015-07-23 15:50:07 |
| Blog: | Mountain Beltway  |
| URL: | http://blogs.agu.org/mountainbeltway/2015/07/23/purcell-sill-layer-jumping/ |
Summary:
After reading the post last weekend about the discordant offshoot of the Purcell Sill, Rich Gashnig (post-doc at Georgia Tech) sent me a few photos he shot at Piegan Pass (at the head of a side-canyon adjacent to the one containing Grinnell Glacier). They show the Purcell Sill leaving one stratigraphic horizon and jumping to another, with the intermediate zone of Helena Formation limestone bending to accommodate the different positions: …Content analysis:
Stratigraphic context:
| Recognized stratigraphic terms [n]: | Helena Formation [1] |
|---|---|
| Agenames chronostratigraphy [rating]: | Precambrian [0.5] Proterozoic [0.1] |
Geographic context:
| Location | Country | Latitude | Longitude |
|---|---|---|---|
| Grinnell | US | 41.7398 | -92.7251 |
| Glacier | US | 48.6541 | -113.126 |
| Georgia Institute of Technology | US | 33.7771 | -84.3982 |
Keywords:
different positions, discordant offshoot, Georgia Tech, Grinnell Glacier, Helena Formation limestone, igneous, intermediate zone, photos, Piegan Pass, post, Purcell Sill, Rich Gashnig, stratigraphic horizon, weekend
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