Ice Caves
Ice caves are deep fissures in the conglomerate bedrock that retain ice through much of the summer, resulting in a cool microenvironment that supports several northern species such as black spruce, hemlock, rowan, and creeping snowberry (Gaultheria hispidula), and bryophytes such as Isopterygium distichaceum. These ice caves are concentrated near Sam's Point in the northern Shawangunks. Larger limestone caverns occur along the lower slopes of the Rondout and Delaware River valleys.
Lakes and wetlands occur mostly on the flat-topped ridges at the northern and southern ends of the area and, to a lesser extent, along the western side of the middle part of the ridge. Lakes and ponds occurring on conglomerate tend to be clear, nutrient-poor, and very acidic, due to limited buffering capacity of the bedrock. The northern Shawangunks have five lakes, the "sky lakes," which are, from north to south: Mohonk Lake, Lake Minnewaska, Lake Awosting, Mud Pond, and Lake Maratanza. The pH in four of the lakes averages about 4 (very acidic); Lake Mohonk, which partially overlays shale bedrock and is therefore partially buffered, is closer to neutral pH (7.0).
Read more about this topic: Shawangunk Ridge
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