Loysburg Gap, Pennsylvania
Yellow Creek flows eastward through the gap towards its junction with the Raystown Branch of the Juniata River. Periglacial boulder fields are present on both sides of the water gap, and the boulders are formed of the Silurian Tuscarora Formation.
- Periglacial Boulders at Loysburg Gap, video about the boulders at Loysburg Gap
- Atlas of preliminary geologic quadrangle maps of Pennsylvania, Map 61, Pennsylvania Geological Survey, Compiled and edited by Thomas M. Berg and Christine M. Dodge, 1981. Hopewell Quadrangle (Compiled by D. M. Hoskins, 1976)
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