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Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.
The top plate illustrates the tectonic setting for the sediments of Pennsylvania. This section is characterized by the metamorphic rocks that provide much of the bedrock for this area. The oldest exposed rocks in Pennsylvania are found here and consist of the Baltimore Gneiss. [8] These rocks have a complex history and a vast array of different ...
Today this tourmaline locality (type locality for dravite) at Dobrova (near Dravograd), is a part of the Republic of Slovenia. [9] Tschermak gave this tourmaline the name dravite, for the Drava river area, which is the district along the Drava River (in German: Drau, in Latin: Drave) in Austria and Slovenia.
Hillman Hall of Minerals and Gems Native sulfur, Baja California. The Hillman Hall of Minerals and Gems is a notable mineral and gem collection within the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania. Comprising over 1,300 specimens, Hillman Hall has gained a reputation as one of the finest mineral exhibitions in the United States
The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland and West Virginia. [2] [3] [4] It is largely quartz sandstone with some quartzite and quartz schist. It preserves Skolithos trace fossils dating back to the Cambrian Period. [5]
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The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order. [1] System Group name Formation name Member name
The Oley Hills site, or Oley Hills stone work site, located in Berks County, Pennsylvania, is an enigmatic complex of snaking dry stone walls, carefully shaped rock piles or cairns, perched boulders, and unusually shaped natural boulders. [1]
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