LIST OF AMERICAN FORMATIONS. 



1517 



Longfellow formation. Canadian. Ari- 

 zona. 



Longwood shale limestone, Lower Oay- 

 ugan, New Jersey and New York. 



Lorraine formation, Cincinnatian. New 

 York and Ontario. 



Louisville limestone, Niagaran, Ken- 

 tucky, Tennessee, and Indiana. 



Lower Blue, Black River, Wisconsin, ejtc. 



Lower Buff (=Minneapolis limestone), 

 Black River, Minnesota, Wisconsin, 

 etc. 



Lower Magnesian dolomite, includes 

 Cambrian, Ozarkian and Canadian, 

 Mississippi Valley. 



Lowville limestone, Black River, New 

 York, Canada, Appalachian and Missis- 

 sippi Valleys. 



Lucas dolomite, Upper Monroan, Michi- 

 gan, etc. 



Lulbegrud clay, Clinton, Eastern Ken- 

 tucky. 



Macastey black shale, Trenton, Anticosti 

 Island, Quebec. 



Maddox limestone, Upper Medinan and 

 Clinton, West Tennessee. 



Madison bed (=Saluda), Richmond, In- 

 diana. 



Madison sandstone, Upper Cambrian or 

 Ozarkian, Wisconsin. 



Magnesian limestone, has included Cam- 

 brian to Silurian, Mississippi Valley. 



Malignant Cove formation, Ordovician, 

 Nova Scotia. 



Manhattan schist, Ordovician (??), New 

 York. 



Manitou limestone, Canadian, Colorado. 



Manitoulin member of Cataract, Upper 

 Medinan, Ontario. 



ManUus limestone, Upper Cayugan, New 

 York and New Jersey. 



Mannie shale, Richmond, Tennessee. 



Maquoketa shale, Richmond, Iowa, Illi- 

 nois, Missouri, and Minnesota. 



Marble Hill marble, Richmond, Indiana. 



Marsouin series, Mohawkian, Quebec. 



Martinsburg 'shale, Trenton-C incinnatian, 

 West Virginia, Pennsylvania, Mary- 

 land, and Virginia. 



Mascarene series, Silurian, New Bruns- 

 wick. 



Massanutten sandstone, Cincinnatian and 

 Medinan, Virginia. 



Matinal, Ordovician, Pennsylvania. 



Maxford formation, Cambrian (not Ordo- 

 vician), Utah. 



Maysville group, Upper Cincinnatian. 



Mayville dolomite, Niagaran, Wisconsin. 



Maywood formation, Upper Cambrian 

 (not Silurian), Montana. 



Me Ad am formation, Niagaran, Nova 

 Scotia. 



McCoytown sandstone, Silurian. Penn- 

 sylvania. 



McCune dolomite, Trenton, Missouri. 



McKenzie formation, Lower Cayugan, 

 West Virginia, Pennsylvania and Mary- 

 land . 



McMicken member, Eden, Ohio Valley. 



McMillan formation, Cincinnatian, Ohio 

 Valley. 



Medina sandstone, Silurian, New York, 

 Ontario, etc. 



Medinan series or epoch, Silurian. 



Memphremagog slates, Ordoviciau, Ver- 

 mont. 



Mendota dolomite, Upper Cambrian or 

 zarkian , Wisconsin . 



Meniscus beds, Niagaran, west Tennes- 

 see. 



Mifflintown, limestone, Silurian, Penn- 

 sylvania. 



Millersburg division of Cynthiana, Tren- 

 ton, Kentucky. 



Million beds, Eden, Kentucky. 



Millstream series, Ordovician, New Bruns- 

 wick. 



Mimbres limestone, Canadian, New Mex- 

 ico. 



Minneapolis limestone (=Lower Buff), 

 Black River, Minnesota. 



Mistassini limestone, Ordovician (?), 

 Quebec. 



Moccasin limestone, Black River, Vir- 

 ginia and Tennessee. 



Moduria limestone, Ordovician, Georgia. 



Mohawk limestone. See Mohawkian. 



Mohawkian series or epoch, Middle Ordo- 

 vician. 



Monarck formation, Devonian (not Si- 

 lurian), Montana. 



Monclova sandstone (=Sylvania), Mon- 

 roan, Ohio. 



Monroan = Upper Cayugan and Helder- 

 bergian. 



Montecello terrane, Silurian, Iowa. 



