United States Geological Survey YearbookThe Survey, 1987 - Forest reserves |
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Results 1-5 of 93
Page i
... Sedimentary Rocks Cretaceous Augen Gneiss Permian - Devonian Sedimentary Rocks Cambrian Sedimentary Rocks Cambrian - Proterozoic Rocks Precambrian Undifferentiated Belt Supergroup Tectonically Disturbed Rocks DEPARTMENT OF THE INTERIOR ...
... Sedimentary Rocks Cretaceous Augen Gneiss Permian - Devonian Sedimentary Rocks Cambrian Sedimentary Rocks Cambrian - Proterozoic Rocks Precambrian Undifferentiated Belt Supergroup Tectonically Disturbed Rocks DEPARTMENT OF THE INTERIOR ...
Page 1
... Sedimentary Strata MIDDLE PROTEROZOIC. Perspectives the Great Lakes By William F. Cannon The Great Lakes cover about 98,000 square miles of the Earth's surface , an area approximately equal to the combined land areas of the States of ...
... Sedimentary Strata MIDDLE PROTEROZOIC. Perspectives the Great Lakes By William F. Cannon The Great Lakes cover about 98,000 square miles of the Earth's surface , an area approximately equal to the combined land areas of the States of ...
Page 2
Geological Survey (U.S.). MICH . IND . OHIO EXPLANATION Sedimentary Strata MIDDLE PROTEROZOIC ( 1600-900 m.y. ago ) Grenville Province Keweenawan rocks EARLY PROTEROZOIC ( 2500-1600 m.y. ago ) Southern Province ARCHEAN ( before 2500 m.y. ...
Geological Survey (U.S.). MICH . IND . OHIO EXPLANATION Sedimentary Strata MIDDLE PROTEROZOIC ( 1600-900 m.y. ago ) Grenville Province Keweenawan rocks EARLY PROTEROZOIC ( 2500-1600 m.y. ago ) Southern Province ARCHEAN ( before 2500 m.y. ...
Page 5
... sedimentary rocks . Study of these units on land indi- cates they were deposited in a feature known as the Mid - Continent Rift , a major continental - scale structure that curves in a broad are from Kansas through Lake Supe- rior and ...
... sedimentary rocks . Study of these units on land indi- cates they were deposited in a feature known as the Mid - Continent Rift , a major continental - scale structure that curves in a broad are from Kansas through Lake Supe- rior and ...
Page 6
... Sedimentary rocks Sedimentary rocks and interlayered basalt flows Basalt flows and interlayered sedimentary rocks Crust of Archean Superior province Granitic and metavolcanic rock near surface Bend in line 369 12 KILOMETERS ...
... Sedimentary rocks Sedimentary rocks and interlayered basalt flows Basalt flows and interlayered sedimentary rocks Crust of Archean Superior province Granitic and metavolcanic rock near surface Bend in line 369 12 KILOMETERS ...
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