"[1] The geological survey operates under the Pennsylvania Department of Conservation and Natural Resources.
The fourth, and current, survey was created in 1919 and continues today.
The Survey has provided orthoimagery and digital topographic data derived from lidar through the PAMAP program.
The Survey provides oil and gas well information through PA*IRIS.
BTGS participates in federally funded StateMap program to produce 1:24000 geological maps.