A Resource for Information on the Commonwealth's Geology
The level of the sea has been measured at Sewells Point, Virginia continuously since 1928. In 1928 the mean level of the sea was ~45 cm ( ~18″) lower than it is in 2016. Sea level rise and regional land subsidence is creating an ever-growing problem in Hampton Roads and most of coastal Virginia.
This exposure in a pasture near Cuckoo exposes a poly-deformed hornblende and plagioclase-rich gneiss. Foliation in the gneiss has been refolded. Another interesting feature is the presence of garbenschiefer or “feather amphibolite.” This unusual texture is defined by stellate and featherlike hornblende clusters in the plane of foliation. Three amphibole species occur in this rock […]
When large quantities of magma intrude and solidify in the Earth’s crust they form bodies of intrusive igneous rock known as plutons. The featured image nicely illustrates the edge (geologic contact) of a granitic pluton in the Blue Ridge Mountains of central Virginia. The granite is part of the 706 ± 4 million year old […]