220 REPORT OF NATIONAL MUSEUM, 1904. 



The classification of the geological formations as adopted by Maclure 

 in the later issue and as given below, was naturally largely Wernerian: 



Class I. Primitive rocks. 



(Sienna brown. ) 



(1) Granite, (2) Gneiss, (3) Mica slate, (4) Clay slate, (5) Primitive limestone, 

 (6) Primitive trap, (7) Serpentine, (8) Porphyry, (9) Sienite, (10) Topaz-rock, (11) 

 Quartz-rock, (12) Primitive flinty slate, (13) Primitive gypsum, (14) White stone. 



Class II. Transition rocks. 



(Carmine.) 



(1) Transition limestone, (2) Transition trap, (3) Graywacke, (4) Transition flinty 

 slate, (5) Transition gypsum. 



Class III. Floetz or secondary rocks. 



(Light blue.) 



( 1 ) (dark blue) Old red sandstone, or First sandstone formation, (2) First or oldest 

 Floetz-limestone, (3) First or oldest Floetz gypsum, (4) Second or variegated sand- 

 stone, (5) Second Floetz gypsum, (6) Second Floetz limestone, (7) Third Floetz 

 sandstone, (8) Rocksalt formation, (9) Chalk formation, (10) Floetz trap formation, 

 (11) Independent coal formation, (12) Newest Floetz trap formation. 



Class IV. Alluvial rocks. 



(Yellow.) 



(1) Peat, (2) Sand and gravel, (3) Loam, (4) Bog iron ore, (5) Nagel-fluh, (6) Calc 

 tuff, (7) Calc sinter. 



His alluvial class, it will be observed, occupied that portion of the 

 Atlantic border beginning with Long Island and extending southward 

 and westward to the western Louisiana line, comprising the beds now 

 mapped by the U. S. Geological Survey as in part Cretaceous, but 

 mainly Tertiary and Quaternary, and forming what is known, from 

 a physiographic standpoint, as the Coastal Plain. The materials 

 were described as mainly sands and cla}^s, with considerable beds of 

 shell deposits, and in New Jersey a greenish-blue marl (the Cretaceous 

 glauconitic marls of recent workers), used as a manure. There were 

 also noted deposits of iron ore and ochre. His Primitive Class was 

 essentially the area mapped as Archean on the latest IT. S. Geological 

 Survey maps; the Transition, the narrow belt of sedimentaries along 

 the Appalachian range including the various horizons from Algonkian 

 to Carboniferous; and the Secondary class, all that area to the west 

 now known to be occupied mainly by Carboniferous and Silurian rocks 

 with smaller areas of Algonkian and Cambrian. The red-brown sand- 

 stones (Triassic) of the Eastern States were classed as Floetz or Sec- 

 ondary and called Old Red Sandstone. This sandstone he however 

 separated by a deeper blue in the 1818 issue from the secondary rocks 

 on the western side of the range, because of its having a slight dip 

 and agreeing, in the absence of organic remains and its relative posi- 



