1518 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Montgomery limestone ( =Brassfield), Up- 

 per Medinan, Ohio. 



Montgomery limestone, Niagaran. Cali- 

 fornia. 



Montoya limestone (Richmond), Texas 

 and New Mexico. 



Moreau sandstone, Ozarkian, Missouri. 



Morehouse quartzite, Ordovician and 

 Silurian (?), Utah. 



Mosheim limestone, Stones River, Ten- 

 nessee and Virginia. 



Mottled limestone, Black River or Rich- 

 mond, Canada. 



Mount Auburn beds, Maysville, Ohio 

 Valley. 



Mount Hope beds, Maysville, Ohio Val- 

 ley. 



Mount Joli massive, Ordovician, Quebec. 



Moimt Pleasant phosphate (=Bigby), 

 Trenton, central Tennessee. 



Mount Washington series, Ordovician, 

 Massachusetts. 



Moydart formation, Niagaran, Nova 

 Scotia. 



Murat limestone, Chazyan, Virginia. 



Murfreesboro (Central) limestone, Stones 

 River, Tennessee and Virginia. 



Nashville group, Trenton and Maysville, 

 Tennessee. 



Natural Bridge limestone, Canadian, Vir- 

 ginia. 



Nazareth cement rock, Trenton, north- 

 east Pennsylvania. 



Neeleytown limestone, Ozarkian, New 

 York. 



Newburgh limestone, Cambrian-Ordovi- 

 cian, New York. 



Newsorn shale (=Waldron), Upper Niag- 

 aran, Tennessee. 



Niagaran series or epoch, Silurian. 



Nicholas bed of Cynthiana, Trenton, 

 Kentucky. 



Nisky limestone, Ordovician, Pennsylva- 

 nia. 



Nittany limestone, Canadian, Pennsylva- 

 nia. 



Noblesville dolomite, Niagaran, northern 

 Indiana. 



Noix oolite, Upper Medinan, Illinois and 

 Missouri. 



Normandy limestone, Middle Ordovi- 

 cian, Tennessee. 



Normanskill shale, Chazyan, New York, 

 New Jersey, etc 



North Peak formation, Ozarkian and 

 Utah. 



Octoraro schist, Ordovician, Pennsylva- 

 nia. 



Oldham limestone, Clinton, eastern 

 Kentucky. 



Oneida conglomerate, Upper Medinan, 

 New York. 



Oneota dolomite, Ozarkian, Iowa. 



Onondaga salt group (=Salina). 



Orchard Creek shale (lower member of 

 Girardeau), Upper Medinan, Illinois 

 and Missouri. 



Oregon dolomite, Black River, Ken- 

 tucky. 



Oregonia division of Arnheim, Richmond, 

 Ohio Valley. 



Osgood limestone, Niagaran, Ohio Valley. 



Oswego sandstone, Cincinnatian, New 

 York and Pennsylvania. 



Ottosee shale, Blount group, Tennessee 

 and Virginia. 



Ouachita shale, Canadian, Arkansas. 



Pacific sandstone, Big Buffalo series, 

 Arkansas. 



Paint Lick member, Eden, Kentucky. 



Pamelia limestone, Stones River, Quebec, 

 Ontario, and New York. 



Panola formation, Upper Medinan to De- 

 vonian, eastern Kentucky. 



Paradise limestone, Silurian, LTtah. 



Paris bed, Trenton, Kentucky. 



Peachbottom elates, Ordovician (?), 

 Maryland . 



Pearisburg limestone, Upper Chazyan, 

 Virginia and Tennessee. 



Peekskill granite, Ordovician (?), New 

 York. 



Pelham (Trenton) limestone, Ordovician, 

 Alabama . 



Pembroke formation, Silurian, Maine. 



Perryville limestone, Trenton, Kentucky. 



Phillipsburg limestone, Canadian, Que- 

 bec, etc. 



Picton limestone, Trenton, Quebec, 

 etc. 



Pierce limestone, Stones River, Tennes- 

 see and Virginia. • 



Pittsford shale, Lower Cayugan, New 

 York. 



Platteville limestone. Black River, Illi- 

 nois, Iowa, and Minnesota. 



Plattin limestone, Black River, Missouri 

 and Illinois. 



