.1 Sfndii "f ^^"' liclcldara Beds. — Criiijiu. 'MM 
ble. They comprise the sediments from which Prof. Hill has 
recently reported remains of dicotyledonous leaves, referred 
by Mr. Knowlton to the following Dakota types: 
Rhus iiddeni Lesquereux. Sassafras sp. nov. 
Sterculia snoicii Lx. Glyptostrobus gvacdUnnis Lx. 
Sassafras mudgei Lx. Sequoia sp. 
Sassafras cretaceum Newberry. 
They are separable into two fairly distinct and constant 
horizons, the Lanphier beds and the Stokes sandstone. 
THE LANPHIER BEDS. 
These beds, frequently observed but not treated of hitherto 
by the writer, have recently been described by Prof. Hill, be- 
ing No. 2 of his Black Hills and Blue Cut sections. Thej^ are 
named from a draw that runs through the Lanphier claim and 
that may be called the Lanphier draw. The latter rises in a 
basin-like hollow at the foot of Stokes hill, but a short dis- 
tance south of the Natural corral. Around this hollow the 
Lanphier beds are well exposed. They are still well developed 
where they disappear beneath the South Elk-Havard divide, 
and in the vicinity of the Blue cut, and again on man}' of the 
branches of the upper part of Big Mule creek. 
They comprise some ten or fifteen feet of incoherent, more 
or less shaly sands, sometimes passing into shales, often heav- 
ily charged with carbonaceous matter, pyrites of iron and 
selenite crystals, and including numerous fragments of lignite. 
They are finely exposed at the head of one of the south-side 
branches of South Elk creek, near the Barber-Comanche 
county line ; and here and on some of the branches of Big- 
Mule creek, especially Indian creek among the latter, they are 
charged with peculiar lumps of half lignitized and liaUpyrit- 
ized wood, which may conveniently be called c((rh(>ii!/rite^ and 
fantastic concretions of iron-sandstone and linionite, in which 
the linionite is ])seudoni()ri)lii(' aflcr pyritc 'IMicsc are of end- 
less shapes. Some look like jug-handles (tr tubercular crook- 
neck squashes. Some that attain a dianietci- oi several inches 
are spheroidal and other shaped aggregations of ciiliica! and 
modified crystals of linuHiite after pyrite. 
THE STOKES SANIJSToM:. 
The Lanphier beds pass gradually upw.-ird into the sinii- 
larly leaf-bearing Shikes sandsfonc. n few leet in thii-kness 
