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Jack-o'-Lantern Mushrooms (Omphalotus olearius), Woodland near Panther Swamp, Promised Land State Park, Pennsylvania, USA
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Outcrop and Boulders of the York Haven Diabase, the Devil's Den, Gettysburg National Military Park, Pennsylvania, USA
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High Ground on South Mountain, Part 1: Pole Steeple, Michaux State Forest / Pine Grove Furnace State Park, Pennsylvania, USA
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High Ground on South Mountain, Part 2: Trace Fossils in the Montalto Quartzite, Pole Steeple, Michaux State Forest / Pine Grove Furnace State Park, Pennsylvania, USA
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Very Invasive but Very Beautiful, Part 1: Japanese Knotweed (Fallopia japonica) Thriving in an Old Quarry, Evansburg State Park, Pennsylvania, USA
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Very Invasive but Very Beautiful, Part 2: Japanese Knotweed (Fallopia japonica) Thriving in an Old Quarry, Evansburg State Park, Pennsylvania, USA
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Very Invasive but Very Beautiful, Part 3: Japanese Knotweed (Fallopia japonica) Thriving in an Old Quarry, Evansburg State Park, Pennsylvania, USA
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Architectural Geology of Pennsylvania, Part 1: Cameron Mansion, Kings Gap Environmental Education Center, Carlisle (ca. 1908)
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The Felsenmeer Files, Part 2: The Remains of an Ancient Mountain Range; Hickory Run State Park, Pennsylvania, USA
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The Felsenmeer Files, Part 3: Blocks of Rocks | Hickory Run State Park, Pennsylvania, USA
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The Felsenmeer Files, Part 4: E Pluribus Unum | Hickory Run State Park, Pennsylvania, USA
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The Felsenmeer Files, Part 5: Rinky-Dink Geology at Ringing Rocks County Park | Bucks County, Pennsylvania, USA
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The Felsenmeer Files, Part 6: A Real Adventure Playground | Ringing Rocks County Park, Bucks County, Pennsylvania, USA
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The Felsenmeer Files, Part 7: A Boulder Divided Can Stand For a Long Time | Ringing Rocks County Park, Bucks County, Pennsylvania, USA