Depends on whether you were here in the
Ice Age or Today.
Hemlock Trees (the PA state tree) abound
in this area.
The geology of the park was also
heavily influenced by the glacial effects of the ice age: a
large glacial lake (water that was held in place by a
glacier), broke about 140,000 years ago. This break in the glacial dam caused a
dramatic change in the flow of the water. The lake that had previously drained
in a northward direction was now draining to the south. The drastic change in
direction and very high volume of water flow created Slippery Rock Creek Gorge.
The bedrock was formed over 300,000,000 years ago as layers of peat, mud and sand
were compressed. This part of Pennsylvania was a coastal area at the time.
layers of bedrock were built into mountains as the continental
plates shifted. The layers of bedrock had different strengths. Some of
the layers eroded quickly and others eroded at a much slower pace. The various
erosion rates account for the variety of geologic features at McConnells Mill
Daniel Kennedy opened agristmillon Slippery Rock Creek in 1852. The mill was destroyed by
fire in 1868 and was quickly rebuilt. Ownership of the mill was transferred to
the park's namesake, Thomas McConnell in 1875. He replaced thewaterwheelwithwater turbinesand thegrindstoneswithrolling mills. This made McConnell's Mill one
of the first rolling mills in the country. The mill processedoats,corn,buckwheatandwheatuntil it was closed in 1928.
Species/genus: Castilleja wightii, Castilleja affinis ssp. affinis-- Family:Scrophulariaceae-- Common name:Indian paintbrush-- Description:Indian paintbrush belongs to a group of perennial herbs native to North and South America.
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