Portland Arch Nature Preserve

Portland Arch Nature Preserve
Portland Arch Nature Preserve
	Portland Arch from the south
	Map of Indiana
Location	Fountain County, Indiana
Nearest city	Fountain
Coordinates	40°13′07″N 87°20′09″W / 40.21861°N 87.33583°W
Area	435 acres (1.76 km2)
Governing body	Indiana Department of Natural Resources
U.S. National Natural Landmark
Designated	1973

Portland Arch Nature Preserve is a 435-acre (1.76 km²) nature preserve near the Wabash River in Fountain County, Indiana, US, and is a National Natural Landmark. The preserve encompasses the wooded valleys, ravines and rocky cliffs around the lowest section of Bear Creek, which flows northwest toward the Wabash River. Its name comes from the nearby town of Fountain, which was originally named Portland, and from a natural sandstone bridge carved by a small tributary of Bear Creek.

Portland Arch Nature Preserve is managed by the Indiana Department of Natural Resources.

Geology

Portland Arch is one of only a few natural arches in Indiana. The arch was created through the Mansfield Sandstone by Bear Creek, undercutting the bluff on both sides. The sandstone was strong enough that it did not collapse. The Mansfield Sandstone is from the Pennsylvanian Period, some 230 million years ago. The cross stratification of the layers were formed in s shallow bottomed lake where it drops into deeper water. The slope reflects the change from the shallows into deeper water. Are like this were used as rock shelters by Native Americans and early pioneers. Along the valley escarpment, talus rocks have fallen into the valley.^[1]

References

^ Portland Arch Nature Preserve and National Natural Landmark; Indiana Department of Natural Resources, Division of Nature Preserves; Indianapolis, Indiana; August 2007

External links

[1] Portland Arch Nature Preserve and National Natural Landmark; Indiana Department of Natural Resources, Division of Nature Preserves; Indianapolis, Indiana; August 2007

[1]

v t e Protected areas of Indiana
National Park Service	George Rogers Clark National Historical Park Indiana Dunes National Park Lewis and Clark National Historic Trail Lincoln Boyhood National Memorial
National Forest	Hoosier
National Wildlife Refuges	Big Oaks Muscatatuck Patoka River
National Natural Landmarks	Big Walnut Creek Cabin Creek Raised Bog Calvert and Porter Woods Nature Preserve Cowles Bog Donaldson Cave System and Woods Dunes Nature Preserve Fern Cliff Nature Preserve Hanging Rock and Wabash Reef Harrison Spring Hoosier Prairie Marengo Cave Meltzer Woods Ohio Coral Reef (Falls of the Ohio) Pine Hills Natural Area Pinhook Bog Pioneer Mothers Memorial Forest Portland Arch Nature Preserve Rise at Orangeville Rocky Hollow-Falls Canyon Nature Preserve Tamarack Bog Nature Preserve Wesley Chapel Gulf Wesselman Park Woods Wyandotte Cave
State Parks	Brown County Chain O'Lakes Charlestown Clifty Falls Deam Lake Falls of the Ohio Fort Harrison Harmonie Indiana Dunes Lincoln McCormick's Creek Mounds O'Bannon Woods Ouabache Pokagon Potato Creek Prophetstown Shades Shakamak Spring Mill Starve Hollow Summit Lake Tippecanoe River Turkey Run Versailles White River Whitewater Memorial
State Forests	Clark Ferdinand Frances Slocum Greene–Sullivan Harrison–Crawford Jackson–Washington Martin Morgan–Monroe Owen–Putnam Pike Ravinia Salamonie River Selmier Yellowwood
State Fish and Wildlife Areas	Hovey Lake Jasper–Pulaski Kankakee Kingsbury LaSalle Pigeon River J. E. Roush Tri-County Willow Slough Winamac
Category Indianapolis Indiana Department of Natural Resources Commons