Lacawac Hiking Trails
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  Glacial Erratic Rock

Picture

This rock was left here by the Wisconsin Glacier 13,000 years ago. Notice that the rock has been split down the middle. This was caused by a type of mechanical weathering called frost wedging. 


The crack grew by the constant freezing and thawing of water. At first this split was a small crack. After it would rain, the crack would fill and hold water. Then the water would freeze and expand to make the crack grow bigger. This process has happened over and over again causing the rock to look the way it does now. 

Location

About lacawac sanctuary

Lacawac Sanctuary Field Station and Environmental Education Center is an independent, non-profit, environmental education organization located on the shore of Lake Wallenp​aupack in the Northern Poconos.  We operate solely on program fees, memberships, sponsorships, grants and private donations from people like you

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  • Home
  • About
    • Sources
    • Contact Us
  • Maurice Broun Trail
    • Fields & Meadows
    • Stone Walls
    • Gypsy Moth Caterpillars
    • Oak Trees >
      • White Oak
      • Red Oak
      • Black Oak
    • Raccoons
    • Owls
    • Snakes >
      • Snake ID
    • Bats >
      • Bat Houses
  • Lake Lacawac Trail
    • White Pine
    • Eastern Hemlock
    • Bog Plants >
      • Sphagnum Moss
      • Blueberry Bushes
      • Pickerelweed
    • Lake Lacawac
    • Glacial Bog
    • Diversity of Birds
    • Glacial Erratic Rock
    • American Black Bear >
      • Diet
      • Population
      • Reproduction
  • Big Lake Trail
    • Food Web
    • North American Beaver
    • Osprey
    • Watershed
    • Japanese Barberry >
      • Characteristics
      • Threat to Forest
      • Control Methods
    • Minerals & Rocks >
      • Minerals
      • Igneous Rocks
      • Sedimentary Rocks
      • Metamorphic Rocks
      • Identification
    • Sugar Maple
    • Streams
    • Hydroelectric Dam
    • Lake Wallenpaupack >
      • Electricity Generation
      • Recreation
      • Watershed Management
    • Wild Grapevines
    • Hayscented Fern
  • Carriage-Lakefront Trails
    • Phytoplankton
    • Harmful Algal Blooms
    • Riparian Zones
    • Bioindicators
    • Lake Macroinvertebrates
    • Lake Succession >
      • Oligotrophic Lake
      • Mesotrophic Lake
      • Eutrophic Lake
    • Lake Formation
    • Amphibians
    • Native Fish
    • Lake Research
    • Aquatic Plants
    • Zooplankton
    • Stratification
    • Lake Hydrology
    • Lake Chemistry
    • Monitoring for Preservation
    • Local Research with Global Implications
  • Historic Great Camp Trail
    • Connell Park
    • Sustainable Forestry
    • Hemlock Woolly Adelgid
    • Early Years
    • Field Station
  • Ledges Trail
    • Deer Exclosures
    • Geological Faults >
      • Normal Fault
      • Reverse Fault
      • Strike-slip Fault
    • Wild Orchids
    • Ledges
    • Ferns
    • Mosses & Lichen
    • Vernal Pools
    • Mushrooms
  • Watres Trail
    • Edge Effect
    • Hummocks and Hollows
  • Visitors Center
    • Native Plant Garden >
      • Golden Alexander
      • Black-Eyed Susan
      • Striped Cream Violet
      • Scarlet Beebalm
      • Blazing Star
      • Blue Moon
      • Blue Flag Iris
      • Tickseed
      • Coneflower
      • Butterfly Weed
      • Jerusalem Artichoke
      • Monkshood
      • Joe-Pye Weed
      • Mayapple
      • Blue Wood Sedge
      • Little Blue Stem
    • Bees
    • Weather Station
  • Partner Ridge Trail
  • Warbler Trail