62 Scientific Intelligence. 
Pilot Knob are “grey ‘on an immense scale,” and have the 
average strike N. 50° W. (true course), with the dip to the south- 
west. The rocks include granites and felsitic plete te and por- 
. The 
St. Louis, 662 feet above its “ee and 1,521 "above tide. It con- 
sists at top of a stratum of porphyr ~conglomerate 140 feet thick, 
the pebbles cemented by iron ore. The d below is 46 feet 
thick, and is divided by a layer of fees 10 rained to 3 feet thick; 
the ore-bed rests on clay-slate, below which there is a _ jaspery 
porphyry, and other porphyritic rocks. The ore is hematite. 
Many details of great interest are contained in the sovbionl ——— 
on the i Toestel of which Dr. Schmidt’s occupies 150 pages 
report on Lincoln County, “oe Prof. fcermd ; a re =o on the 
buildi 
e Coal-measures, by C. J. Norwoo 
According to Mr. Broadhead, the Coal-measures of the State 
cover an area of about 22,995 square miles, including 160 square 
miles in St. Louis County, 8 in St. Charles, and a few outliers in 
Lincoln and Warren, and the remainder in northwestern and 
western Missouri. The above area includes 8,406 square miles of 
Upper or Barren Coal-measures, about 2,000 of exposed Middle, 
and 12,420 of exposed Lower Coal-measures. The area over 
which there are coal beds 18 inches thick, within 200 feet of the sur- 
face, is et 7,000 square miles in extent. e maximum thick- 
e Coal-measures is 1 ,887 feet. Mr. Broadhead has illus- 
trated stp wicctinn’ reports by numerous — they also con- 
tain many analyses of the coals, by Mr. Chauvenet. 
The Atlas of the Report, in large folio, fiddacos a topographical 
map of the Pilot Knob region; another showing its geology; 
another erm H the magnetic character of the region ; a map 
aoe ng the distribution of the iron ores of the State; a oolog- 
cal map of lacs County; another of northern Missouri; besides 
various plates of geological sections. All are well engray ed, and 
met “porate and tastefully colored. The volume throughout is an 
excellent commencement of the series of reports which may be 
ant from the survey now in progress 
of. Pumpelly having resigned the charge of Ps Survey, Mr. 
C. Broadhead has been appointed State Geologi 
a “Return of Professor Marsh’s Expedition.— rof {Marsh and 
party returned to New Haven, November 7th, after an absence of 
five months in the Rocky Mountain region and on the Sie 
oast. The t expedition had the same object in 
those of previous years, viz: _a@ study of the vertebrate foasils of 
the west, those of d Tertiary formations. 
The first explorations this year were made in the Pliocene deposits 
near the Niobrara River. The party fitted out in June at Fort 
