Editing Butler County, Pennsylvania (section)

===Parks===
There are two [[List of Pennsylvania state parks|Pennsylvania state parks]] in Butler County.
*[[Jennings Environmental Education Center]] is the home of the only protected [[relict]] [[prairie]] in Pennsylvania.
*[[Moraine State Park]] The gently rolling hills, lush forests and sparkling waters disguise a land that has endured the effects of continental glaciers and massive mineral extraction. Each year over one million people visit the {{convert|16725|acre|km2|adj=on}} park, yet never realize that many people helped restore the park from prior coal mining and oil and gas drilling practices. Today, the park is an outstanding example of environmental engineering achievement. During the third great ice advance about 140,000 years ago, a continental glacier dammed area creeks making three glacial lakes. To the north, [[Slippery Rock Creek]] filled giant Lake Edmund. To the southeast, extinct McConnells Run filled tiny Lake Prouty. In the middle, Muddy Creek filled the medium-sized Lake Watts.

Before the glacier dam, Slippery Rock and Muddy creeks flowed north while extinct McConnells Run flowed south. The glacier dammed Lake Prouty on the edge of the drainage divide. Eventually Lake Pouty spilled over and rushed to the south, carving Slippery Rock Creek Gorge. Lakes Watts and Edmund drained into the gorge, digging it deeper and making Slippery Rock and Muddy creeks flow south. Areas of the {{convert|400|ft|m|adj=on}} deep Slippery Rock Gorge may be seen at nearby [[McConnells Mill State Park]].

The glacier created a landscape of rolling hills topped with hardwood trees and swamps in the valley bottoms. Moraines containing gravel, sand and clay were draped upon the landscape and silt was left on the extinct lake bottoms.
Reference to: http://www.dcnr.state.pa.us/stateParks/parks/moraine/moraine_history.aspx