Niagara layer level
The Niagara layer level ( English Niagara Escarpment ) is an extensive layer level in the USA and Canada . It runs through the states of New York , Ontario , Michigan , Wisconsin and Illinois . The relief is formed by hard dolomite rock , which is underlain by softer slate rock . The layer stage is named after Niagara Falls . In February 1990 it was declared a Biosphere Reserve by UNESCO .
The Niagara strata is the most distinctive of several strata, the starting material of which was mainly deposited during the Silurian period in a shallow sea that existed in today's area of the Great Lakes on the Precambrian basement . This sedimentary rock sequence is divided into numerous formations .
The eastern end of the layer stage is east of the valley of the Genesee River near Rochester, New York . From there, the strata stretches first in a westerly direction to the Niagara River , which cut the deep Niagara Gorge into the dolomite north of the Niagara Falls . In southern Ontario, it runs close to the shores of Lake Ontario over the Niagara Peninsula , then through the middle of the city of Hamilton and then turns north to Georgian Bay . It follows the shore of Lake Huron to the northwest, forming the Bruce Peninsula , Manitoulin Island and other islands. The stratification then continues westward in northern Michigan on the Upper Peninsula , turns southwest, follows the Door Peninsula and the west bank of Lake Michigan . Its western end is north of Chicago .
literature
DF Hewitt: The Niagara Escarpment. Industrial Mineral Report No. 35. Ontario Department of Mines and Northern Affairs, Toronto 1971 ( PDF 5.6 MB)
Web links
Individual evidence
- ↑ UNESCO Biosphere Reserves. Niagara Escarpment. In: Ecological Sciences for Sustainable Development. UNESCO , accessed April 11, 2013 .