64 The American Geologist. January, 1901. 
co-operation with the Agricultural Department of that state. 
These maps are now ready for distribution. 
In northern and central Ohio topographic maps of the fol- 
lowing quadrangles have recently been issued : Bowling Green, 
Elmore, Fremont, Vermilion, Euclid, Cleveland, Wooster, 
Dublin, Deleware. 
A conference of eastern hydrographers, called by Mr. F. 
H. Newell, chief engineer of the hydrographic division of the 
Survey, was held m Washington, October 28th to 31st. 
The Snoqualmie (Washington) quadrangle is one of the 
topographic maps recently issued. 
The Olivet (South Dakota) geologic folio (No. 96) is 
ready for distribution. It was prepared by professor J. E. 
Todd and is one of the four folios containing data concerning 
the water resources of South Dakota. 
A party of the Survey, under the direction of Mr. N. H. 
Darton, is investigating the mineral resources, of the Bighorn 
basin, Wyoming. 
Mr. C. E. Siebenthal is investigating the underground wa- 
ter resources of the San Luis valley, Colorado. 
Professor I. C. Russell has discovered a new artesian basin 
in the southeastern corner of Crook county, Oregon. 
Cripple Creek : — The original survey of this district was 
made in 1893 and 1894 by Messrs. Whitman Cross and R. A. 
F. Penrose, assisted by Dr. E. B. Matthews. At that time 
comparatively few mines were in operation and none of them 
had gone deeper than 400 or 500 feet. Since then the number 
of mines has greatly increased and there has been remarkably 
extensive underground development throughout this district. 
These new conditions have made a resurvey of the district 
eminently desirable, if not absolutely essential to the economic 
development of the properties. So desirous were the chief 
mine owners of the district that the work should be done, and 
promptly, that the sum of $3500, equal to half the allotment 
necessary for the work, was raised amongst them by private 
subscription. This was turned over to the state geologist. Mr. 
J. W. Finch, and work was begun by Messrs, Waldemar Lind- 
gren and F. L. Ransome, assisted by Messrs. L. C. Graton and 
A. W. Rock. The field work is now about three-quarters done. 
Tin in Alaska: — In the summer of 1900 stream tin (cas- 
siterite) was reported by Mr. A. H. Brooks in the York region, 
and later more information concerning this mineral was given 
by Mr. Arthur J. Collier. Now Mr. Collier reports that this 
mineral has been traced to its parent ledge. — a granite dike 
cutting limestone. This locality is about fifteen miles east of 
York on a tributary of Lost river, now named Cassiterite creek. 
York is a small settlement on the western extremity of the 
Seward peninsula and about ninety miles northwest of Nome. 
