DESCRIPTIVE GEOLOGY. 21 
found in close association with the limestone, which also contains 
quartz pebbles. 
Most of the rocks encountered in the Rampart region form a con- 
tinuation along the strike of those occurring in the section from the 
White Mountains nearly to Yukon Flats. The same lithologic types 
and the same associations are found, and, so far as the meager fossil 
evidence is available, it corroborates the relationship of the rocks in 
the two areas. Similar rocks are developed south of Tanana River, 
where extensive masses of altered rhyolite occur with them. This 
correlation is based on lithologic and stratigraphic evidence alone. 
The fossils collected by the Survey in L904 are mentioned in the 
following list. The determinations were made by E. M. Kindle, of 
the United States Geological Survey. 
Fossils from the White Mountains. 
4AP240. This lot contains two coral's, a Miohelina and a Zaphrentis, neither 
of which is specifically determinable. Horizon probably Devonian. 
4AP241. Favosites near epidermatus occurs in tbis collection indicating a 
horizon of Middle Devonian age. 
1 AP242. Specimens of a coral comparable with Favosites winchelli comprise 
the collection from this locality. Horizon probably Middle Devonian. 
4 AP 243, 245, and 246. These lots represent the same horizon. The fauna 
represented in the collection comprises a single species of brachiopod Gypidula 
cf. pseudogaleatus. The horizon represented is either late Silurian or early 
Devonian, probably the latter. 
4 AH 180. Includes only poorly preserved specimens of Cladopora. Probablj 
of Middle Devonian age. 
4 AH 193. The fossils represented are Cytherella sp., Cladopora sp., una 
Ptilodictya f cf. frondosa. The horizon is probably Silurian. 
4 AH 194. Favosites near limitaris occurs in this lot, indicating a horizon 
probably near Middle Devonian. 
4 AH 195. Contains an undetermined Stromatopora. Age probably Devonian. 
Fossils from the Rampart region. 
4AP303. Two poorly preserved specimens of Aulacophyllwrn comprise this 
lot. The horizon represented may be either Devonian or Silurian so far as the 
evidence from this material indicates. 
4AP317. Minute fragments of small corals in a breccia comprise this lot. 
Fossils too fragmentary for determination of the age. 
Additional material from the Rampart region collected during 
1907 was also referred to Mr. Kindle, and the following is quoted 
from his report : 
TAP 277 (Quail Creek). This lot contains several species of corals and 
fragmentary representatives of a large lamellibranch and a gasteropod. They 
are referred provisionally to the following genera : 
Cladopora? l dphyphyllum. 
Syringopora. Megalomns?? 
Amplexus? Pleurotomaria? 
Streptelasma ? 
