File:Country Rock Intruded.jpg

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English: Country Rock Intruded. A USGS map, from an article, about part of the US states of Virginia and West Virginia. On the article, can't find an explicit date (?!). Though as far as I can tell, the actual location is fictional. Notes, Figure 16. Eruption sequence of an Eocene diatreme following the hydrovolcanic model. A, Eruption commences when an intrusion reaches shallow depths and encounters a rich source of ground water; B, the breccia pipe propagates downward, creating a cone of depression of the water table, while a tuff ring forms around the central crater and the walls of the pipe collapse downward; C, material collapses into the pipe, allowing rocks from higher in the stratigraphic sequence to fall to lower levels, while forming some crude layering. Debris flows away from the crater walls to form volcaniclastic layering.
Date
Source "Middle Eocene Igneous Rocks in the Valley and Ridge of Virginia and West Virginia" - chapter 4 of "Geology of the National Capital Region — Field Trip Guidebook", USGS Circular 1264. https://pubs.usgs.gov/circ/2004/1264/pdf/trip4.pdf
Author Jonathan L. Tso, Ronald R. McDowell, Katharine Lee Avary, David L. Matchen, and Gerald P. Wilkes

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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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