The Internet provides access to a variety of information, but not all of it is accurate, reliable or current. The websites listed below are maintained by reputable organizations and contain trustworthy information.
Federal government agencies
U.S. Geological Survey (USGS)
U.S.G.S. Mineral Resources Program
U.S. Department of the Interior
National Oceanic & Atmospheric Administration (NOAA)
Pennsylvania state agencies
Pennsylvania Geological Survey (also called the Bureau of Topographic & Geologic Survey)
Crystal Cave Park -- Kutztown, PA
Delaware Water Gap National Recreation Area -- Stroudsburg, PA
Hickory Run State Park -- Carbon County, PA
Lackawanna Coal Mine Tour -- Scranton, PA
Lost River Caverns -- Hellertown, PA
"Trail of Geology" guides, published by the Pennsylvania Geological Survey, describe the rock formations you can see at various state parks across the Commonwealth.
Geology Bites is hosted by astrophysicist Oliver Strimpel. Each episode features conversations with experts in a variety of fields related to geology, including geochemistry, geomorphology, mineralogy, paleontology, petrology, volcanology, tectonics, planetary science, and more. To browse the list of episodes by topic, use this index.