The Dalton quadrangle (Ga. - Tenn.), located in northwest Georgia within the Ridge and Valley province, is a fifteen-minute quadrangle with topographic base by the U.S. Geological Survey. Because of the excellence of the base map and the location of the quadrangle in an area of lower Paleozoic rocks, it was selected as a beginning point for a re-investigation of the geology of northwest Georgia.
The Allegheny Mountains of east-central West Virginia were imperfectly peneplained in pre-Schooley time. There is no evidence that any external base level has affected this region since uplift of the pre-Schooley surface, i.e., no peneplains controlled by a base level outside the area have developed since pre-Schooley time. The region has been lowered by differential mass-wasting ever since this uplift.
Metamorphism in the Ollo de Sapo Antiform, part of the Variscan Orogen in NW Spain, was controlled by local, complex interactions of deformation, granitoid intrusions, and regional low pressure metamorphic (LPM) gradient. Detailed analysis of mineral parageneses, in conjunction with geothermobarometry and one-dimensional thermal modeling, have been used to constrain pressure-temperature-deformation (P-T-D) paths for rocks in the antiform.