GEOLOGY AND PALEONTOLOGY. 81 
Pleurotomaria subdecussata Geinitz, rr. 
Pleurotomaria tabulata Hall, rr. 
Nautilus occidentalis Swallow ?, rr. 
Nautilus ponderosus White ??, rr. 
Nautilus cf. planovolvis Shumard, rr. 
Orthoceras cribrosum Geinitz, r. 
Phillipsia scitula Meek and Worthen, c. 
Peripristis semicircularis Newberry and Worthen, rr. 
Petalodus destructor Newberry and Worthen, rr. 
The lower portion of the Burlingame shales has already been described as No. 
6 of the preceding section. The upper portion of them is well exposed along the 
west bank of Mission creek and on the point of the hill between Mission and 
Blacksmith creeks a few rods south of their junction. In the latter place, on 
both sides of the point, about fifteen feet of olive, argillaceous shales are ex- 
posed, with occasional laminz of more calcareous shales which are largely com- 
posed of fossils, mostly pelecypods and bellerophons, with, in one place, myriads 
of ostracod crustaceans. Near the upper part of the exposure, on the east side 
of the point, may be seen a thin layer of coal, some distance above which is a 
heavy limestone (farther south on the hill). At present I know of no place 
where these shales are all well exposed, but in various covered slopes there are 
many indications that in places these shales are quite arenaceous and even con- 
tain sandstone. They are 120 feet thick at the sugar works, six miles west of 
Topeka. Resting on this shale bed at the sugar works is a thin bed of coal, the 
same mentioned at the junction of Mission and Blacksmith creeks, the Silver 
Lake coal, and above the coal is a foot of argillaceous limestone. Along the 
Kansas river this limestone is somewhat continuous, but farther south near the 
head of Blacksmith creek it is, in one place, but a series of large, round, concre- 
tion-like forms, while at another place near there it is wanting. Overlying this 
limestone are shales which are moderately fossiliferous, fifteen to thirty feet in 
thickness, well exposed near the tops of the bluffs just west of the sugar works. 
They are yellow to olive in color and argillaceous. 
Upon these shales rests the Burlingame limestone. This limestone is com- 
posed of four strata. The lowermost is, on the average, about five feet or a lit- 
tle more in thickness. Immediately above this, and separated from it by a thin 
parting of yellow calcareous clay, is another stratum of limestone of the same 
general appearance, but thinner. Both are massive, sparsely fossiliferous, and 
weather to a buff tint. Some distance above the second limestone, but seldom 
well exposed, are two small limestones separated by a parting of shale. 
The fauna of the Burlingame shales and the other strata up to, and including 
the Burlingame limestone, is: 
Fusulina secalica (Say) Fischer, aa. 
Productus nebrascensis Owen, r. 
Lingula mytiloides Sowerby, c. 
.Chonetes granulifera Owen, r. 
Hustedia mormoni (Marcou) Hall and Clarke, r. 
Myalina sp., rr. 
Myalina swallovi McChesney, c. 
Modiola subelliptica Meek, r. 
Nuculana bellistriata Stevens, r. 
Nuculana bellistriata attenuata Meek, rr. 
Aviculopecten rectilaterarius Cox, r. 
Aviculopecten occidentalis Shumard, r. 
—6 
