300 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
M'Elmo formation, Jurassic, Colorado : 
Cross, 604; Cross ct al., 607. 
McKim graywacke, pre-Cambrian, Ontario : 
Coleman, 539. 
McMicken member, Ordovician, Obio and 
Kentucky : Bassler, 156. 
McMillan formation, Ordovician, Ohio : 
Bassler, 156. 
Maderan limestone, Carboniferous, New 
Mexico : Cordon, 982. 
Maderan series, Carboniferous, New Mex- 
ico : Keyes, 1377. 
Madison limestone. Carboniferous, Mon- 
tana : Emmons, 806. 
Madison limestone, Carboniferous, Wyo- 
ming: Darton, 642, 644-647; Fisher, 
873. 
Madison formation. Mississippian, Mon- 
tana : Rowe, 2090. 
Magdalena group, Carboniferous, New Mex- 
ico : Gordon, 982. 
Magnesian, lower, limestone, Ordovician, 
Illinois : Weller, 2517, 2523, 2524. 
Magnesian, lower, limestone, Ordovician, 
Iowa : Leonard, 1559. 
Magnesian, lower, Ordovician, Mississippi 
Valley : Davis, 663. 
Magnesian, lower, limestone, Ordovician, 
Wisconsin : Grant, 1017. 
Magothy formation, Cretaceous, Maryland : 
Clark and Mathews, 488 ; Shattuck et al, 
2193. 
Magothy formation. Cretaceous, Maryland 
and Delaware : Miller, 1749. 
Magothy formation, Cretaceous, New Jer- 
sey : Berry, 214 ; Weller, 2520. 
Mahoning group, Carboniferous, West Vir- 
ginia : Grimsley, 1044. 
Mahoning limestone, Carboniferous, Penn- 
sylvania : Stevenson, 2294. 
Mahoning sandstone. Carboniferous, Penn- 
sylvania : Butts, 308 ; Woolsey, 2634. 
Mahoning sandstone, Carboniferous, Penn- 
sylvania, Ohio, and West Virginia: Gris- 
wold and Munn. 1048. 
Mahoning sandstone, Carboniferous, West 
Virginia : Grimsley, 1040. 
Mamacoke gneiss, Connecticut : Gregory, 
1034 ; Gregory and Robinson. 1038. 
Manasquan marl, Cretaceous, New Jersey : 
Weller, 2520. 
Manastash formation, Tertiary, Washing- 
ton : Smith and Calkins, 2240. 
Mancos shale, Cretaceous : Fenneman and 
Gale, 863. 
Mancos shale, Cretaceous, Colorado : Cross 
et al, 607 ; Taff, 2336. 
Mancos shale, Cretaceous, Colorado and 
New Mexico : Shaler, 2176. 
Manhattan schist, pre-Cambrian, New York : 
Berkey, 207. 
Manitou limestone, Ordovician, Colorado : 
Darton, 648. 
Mankomen group, Permian, Alaska : 
Brooks, 313. 
Manlius limestone, Silurian. New York : 
Grabau, 991; Hartnagel, 1084; Prosser, 
1961. 
Manlius member, Silurian, Maryland : Clark 
and Mathews, 488. 
Mannetto, Pleistocene, New England : Ful- 
ler, 913. 
Mannetto gravel, Quaternary, New York: 
Veatch, 2434. 
Mansfield sandstone, Carboniferous. Illi- 
nois : Blatchley, 245. 
Manzanan series. Carboniferous, New Mex- 
ico : Keyes, 1377. 
Manzano group. Carboniferous, New Mex- 
ico : Gordon, 982. 
Maquoketa formation, Ordovician, Iowa : 
Calvin, 387, 388 ; Leonard, 1559 ; Nor- 
ton. 1805 ; Savage, 2128. 
Maquoketa shale, Ordovician, Illinois : 
Weller, 2517. 2522, 2524. 
Maquoketa shale, Ordovician, Iowa : Grant 
and Burchard, 1021. 
Maquoketa shale. Ordovician, upper Missis- 
sippi Valley : Bain, 99. 
Maquoketa (Hudson River) shale, Ordovi- 
cian, Mississippi Valley : Davis, 663. 
Maquoketa (Hudson River) limestone, 
Ordovician, Wisconsin : Grant, 1017. 
Maquoketa stage, Ordovician, Iowa : Beyer 
and Williams, 234. 
Marathon City conglomerate, pre-Cambrian, 
Wisconsin : Weidman. 2512. 
Marblehead member of Columbus formation, 
Devonian : Swartz, 2329. 
Marcellus shale, Devonian, Michigan : 
Cooper, 575. 
Marcellns shale, Devonian, New York: 
Grabau, 991 ; Luther, 1633 ; Williams, 
2583. 
Marcellus shale, Devonian, Pennsylvania : 
Butts, 367. 
Mareniscan, pre-Cambrian, Michigan : Lane 
and Seaman, 1518. 
Marietta sandstones. Carboniferous. West 
Virginia : Grimsley. 1046. 
Marion beds, Permian, Kansas : Wooster, 
2636. 
Mariposa slates. California : Reid, 2018. 
Marks Head marl, Miocene, South Caro- 
lina: Sloan, 2218. 
Marlboro formation, Cambrian. Rhode 
Island : Emerson and Perry, 790. 
Marlbrook formation. Cretaceous, Arkansas : 
Veatch, 2436. 
Maromas granite-gneiss, Connecticut : Greg- 
ory, 1034; Gregory and Robinson, 1038. 
Marsh formation, Algonkian, Montana: 
Walcott, 2470. 
Marsh shale, Algonkian, Montana : Barrell, 
149. 
Marshall formation, Carboniferous, Michi- 
gan : Cooper, 575. 
Marshall sandstone, Mississippian, Michi- 
gan : Lane, 1516. 
Marshall Hill graywacke, pre-Cambrian, 
Wisconsin : Weidman, 2512. 
Marshalltown clay-marl. Cretaceous, New 
Jersey : Weller, 2520. 
Martinez formation, Tertiary, California: 
Arnold, 57. 
