Breakthroughs in Geology by Graham Park;

Author:Graham, Park;
Language: eng
Format: epub
Publisher: Dunedin Academic Press
Published: 2019-09-15T00:00:00+00:00

Figure 8.3 Map of the Monterey Quadrangle in the Central Appalachians showing the style of the folding. Note the elongated oval shapes of the anticlinal periclines (in pink) bringing the older Ordovician strata to the surface, and the synclinal periclines (in green) with younger Devonian rocks in their cores. After King, 1951.

Figure 8.4 Schematic cross-section of the Central Appalachians showing the near-horizontal detachment zone (red), initially within the Cambro-Ordovician, climbing up into the base of the Upper Ordovician, then into the top of the Silurian. The source of the NW-wards movements is the crystalline massif of the Blue Ridge Province, which is interpreted as having been thrust upwards and emplaced on a higher thrust. UOS, Upper Ordovician-Silurian; D, Devonian; M-P, Mississipian-Pensylvanian. Thrusts in red. After Gwinn, 1964.

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