Monkton Quartzite
Stratigraphic range: Cambrian

Type| Formation
Location
Region|  Vermont
Country|  United States

The Monkton Quartzite is a geologic formation in Vermont. It preserves fossils dating back to the middle of the Cambrian period.

## Contents

* 1 Geology
* 2 See also
* 3 References
* 4 External links

## Geology

The Monkton Quartzite consists of red ferruginous quartzite interbedded with lesser buff and white quartzites.[1] Additionally, there are thick sections of dolomite (dolomstone) containing algal laminations similar to the Winooski Dolostone.[1] The Monkton Quartzite preserves many primary sedimentary features, including wave-action ripples, rain-drop imprints, trilobite tracks, and burrows.[2] The unit contains shallowing upward cycles of subtidal sand shoals overlain by intertidal beds of sand and silt. This shows a prograding tidal flat during a time of clastic deposition on the passive margin of Laurentia.[3][4] Below the erosionally-resistant rocks of the Monkton lies the Dunham Dolostone, and above lies the Winooski Dolostone.[1] The Monkton Quartzite is well exposed at the Redstone Quarry in South Burlington Vermont. Here, the Monkton Quartzites have been thrust to the west by the Champlain Thrust.[3]

Geology student in front of Monkton Formation outside of Burlington, Vermont.

## See also

* List of fossiliferous stratigraphic units in Vermont
* Paleontology in Vermont

## References

1. ↑ 1.0 1.1 1.2 "Monkton Quartzite (VTCAm;0)". http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=VTCAm;0.
2. ↑ "Rocks of Shelburne". http://www.uvm.edu/~shelburn/nature/formations.html.
3. ↑ 3.0 3.1 West, D., Kim, J., Klepeis, K., and Webber, J., 2011, Classic Bedrock Teaching Localities in the Champlain Valley between Middlebury and Burlington, Vermont: in West, D., editor, New England Intercollegiate Geological Conference: Guidebook for Field Trips in Vermont and adjacent New York, 103rd Annual Meeting, Middlebury, Vermont, Trip B1
4. ↑ Merhtens, C.J., Parker, R., Butler, R., The Cambrian Platform in Northwestern Vermont in NEIGC Guidebook for Field Trips Vol 2, 79th Meeting, 1987

## External links

* ((Various Contributors to the Paleobiology Database)). "Fossilworks: Gateway to the Paleobiology Database". http://www.fossilworks.org/cgi-bin/bridge.pl?action=home.

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