1 t 1 STS — G K< )L< )GIC FORM AT IONS. 
301 
Martinsburg formation, Ordovician, Mary- 
land : Clark and Mathews, 488. 
Martinsburg group. Ordovician, Pennsyl- 
vania : Stose, 2318. 
Martinsburg shale, Silurian. West Virginia : 
Grimsley, 1<»44. 
Martinsburg shale group and limestones, 
Ordovician. Virginia: Bassler, 158. 
Maryvillo limestone, Cambrian, Virginia : 
Bassler, 1 58. 
Mascarene series, Devonian. Canada : 1:11s. 
7S4. 
Mason City dolomite, Devonian, Iowa: Wil- 
liams. 2588. 
Massanutten sandstone group, Ordovician. 
Virginia : Bassler, 1 58. 
Matanuska series, Alaska: Martin. 1682. 
Matawan formation. Cretaceous. Maryland: 
Clark and Mathews, 488; Shattuck et al, 
2193. 
Matawan formation, Cretaceous, Maryland 
and Delaware: Miller, 174!>. 
Matawan. Cretaceous, New York : Veatch, 
2434. 
Mat field shales and limestones, Permian, 
Kansas : Wooster, 2636. 
Maucb Chunk formation. Carboniferous, 
Pennsylvania: Butts, 368; Clapp, 475, 
477 : Woolsey, 2634. 
Mauch Chunk formation. Lower Carbon- 
iferous, Pennsylvania : Barrell, 150. 
Mauch Chunk formation. Mississippian, 
Maryland : Clark and Mathews, 188. 
Mauch Chunk shales. Carboniferous, West 
Virginia : Grimsley, 1044. 
Maxville or Bayport formation. Carbonifer- 
ous, Michigan : Cooper. 575. 
Meagher limestone, Cambrian, Montana: 
Emmons, 806. 
Medicine Lodge beds, Permian, Kansas : 
Wooster. 2636. 
Medicine Lodge gypsum, Permian, Kansas : 
Wooster, 2636. 
Medina formation. Silurian, New York* 
Hartnagel, 1085. 
Medina formation. Silurian. West Virginia: 
Grimsley, 1044. 
Memphrenfagog slate, Vermont : Richard 
son. 2037. 
Mentasta schists. Alaska : Brooks, 313. 
Menteth limestone. Devonian, New York: 
Luther, 1634. 
Meramec limestones, Mississippian, Illinois: 
Bowman and Reeds, L'77. 
Merced formation. Tertiary. California: 
Prindle. 1 956. 
Merced series. Pliocene. California : Cran- 
dall, 591. 
Mercer shale. Carboniferous, Pennsylvania : 
Putts, 368. 
Mercer group, Carboniferous, West Vir- 
ginia : Grimsley, 1044. 
Merchantville clay-marl. Cretaceous, New 
Jersey : Weller. 2520. 
Mesaverde formal ion. Cretaceous. Colo- 
rado: Cross cl nl., t)(>7 ; Fennemau and 
Gale, 863 ; Tuff, 2336. 
Mesaverde formation. Cretaceous. Colorado 
and New Mexico: Shaler, L'17r,. 
Mesaverde formation. Cretaceous. Wyo- 
ming : Veatch, L'44<>. 
Mesnard quartzite, pre-Cambrian, Michi- 
gan: Lane and Seaman, 1518. 
Michigamme slate, pre-Cambrian. Michi- 
gan : Gordon and Lane. 985 : Lane and 
Seaman. 1518. 
Michigan series, Mississippian. Michigan : 
Lane. 1516. 
Michipicoten schists, Ontario : Moore, 1770. 
Middendorf beds. Cretaceous. South Caro- 
lina : Sloan. 2217, 21218. 
Middlesex black shale, Devonian, New 
York : Luther, L633. 
Middlesex shales, Devonian. New York: 
Luther, 1634. 
Middletown gneiss, Connecticut: Gregory, 
1o::4: Gregory and Robinson. L038. 
Midway formation. Tertiary. Arkansas 
and Louisiana : Veatch. 2436, 2437. 
Midway group, Eocene. Alabama: Smith, 
Midway group, Tertiary, Mississippi: Cri- 
der, 595; Crider and Johnson, 599. 
Midway stage. Eocene, Mississippi: Logan. 
1608. 
Milford chlorite schist. Connecticut : Greg- 
ory, 1<>.'!4: Gregory and Robinson, 1038. 
Milford granite. post-Cambrian, pro-Car- 
boniferous, Rhode Island : Emerson and 
Perry, 790. 
.Million. Ordovician, Kentucky: Miller, 174S. 
Millsap formation, Carboniferous, Texas : 
Ries. 2058. 
Millsap limestone. Carboniferous, Colorado: 
Darton, <>4X. 
Milwaukee formation, Devonian, Wiscon- 
sin : Alden, 23. 
Mimbres limestone. Siluro-Ordovician, New- 
Mexico : Gordon, 981 . 
Mingo formation. Carboniferous, Ken- 
tucky : Ashley and Glenn, 77. 
Minneapolis limestone, Ordovician, Minne- 
sota : Sardeson. I'llil*. 
Minnesota conglomerate, Algonkian, Michi- 
gan : Lane. 1509. 
Mio-IIuronian. pre-Cambrian. Michigan : 
Lane and Seaman. 1518. 
Missouri group. Pennsylvanian, Missouri : 
Shepard, 2194. 
Missouri stage, I 'ennsyl vanian, Iowa: Beyer 
and Williams, 2.-J4. 
Missourian formation. Carboniferous, Iowa: 
Calvin, 387. 
Mitchell limestone. Mississippian. Indiana : 
Blatchley, 246 : Reagan, 1998. 
Moccasin limestone, ordovician. Virginia: 
Bassler, 158. 
Modelo formation. Miocene, California : 
Eldridge and Arnold. 77!>. 
Modin formation, Jurassic. California: Oil- 
ier, 721. 
Moencopie formation. Carboniferous, New 
Mexico : Keyes, 1377. 
