Mat 8, 1908] 



SCIENCE 



731 



the valley; that the lower peneplains of 

 the Pacific coast provinces may possibly be 

 correlated with the Yukon plateau pene- 

 plain, or with still lower erosion surfaces 

 in the interior; that Schrader's Koyukuk 

 plateau, just south of the Endieott Moun- 

 tains, is to be correlated with the 1,200- 

 1,400 foot peneplain recognized in rem- 

 nants along the Yukon and its tributaries 

 near Eagle, and by more extensive areas 

 farther down the valley; that the summit 

 peneplain of the Rocky Mountains de- 

 scribed by Schrader may be of the same 

 age as the summit peneplain of the Coast 

 ranges. 



The Honeoye-Irondequoit Eame-Moraine : 

 Charles R. Dryer, Terre Haute, In- 

 diana. 



The range of drift hills described ex- 

 tends about fourteen miles in the counties 

 of Livingston, Monroe, and Ontario, N. Y. 

 It is divided by transverse valleys into 

 three principal portions. (1) The Ironde- 

 quoit-Turk Hill portion consists of heavy 

 Kame deposits in the Irondequoit Valley, 

 which, extending eastward over the Turk 

 Hills, appear to be a group of large drum- 

 loids, partly buried and masked by sands 

 and gravel. (2) The Gahyandock Hills 

 consist of massive Kame deposits, super- 

 posed upon a basal terminal moraine, the 

 surface of which is exposed in the border- 

 ing plateaus. These hills rise to 1,100 feet 

 A. T. (3) The Bloomfield-Lima Kame- 

 moraine adjoins (2) on the south, and con- 

 sists of a gravel outwash plain on the 

 north, changing to a typical terminal mo- 

 raine at the southern end. 



The range is cut through by the present 

 valley of Honeoye Creek at its southern 

 end, where well borings show the presence 

 of a deeply drift filled preglacial valley. 

 '(1) and (2) are separated by the Rush- 

 Victor glacial river valley which was a line 

 of eastward drainage for melting ice and 

 subsequent lake waters. The filled valley 



of the lower Irondequoit has a rock bottom 

 below the level of Lake Ontario and is 

 thought to have been the preglacial outlet 

 of the Honeoye Valley. The whole range 

 was a continuous marginal deposit during 

 the retreat of the Wisconsin ice sheet and 

 marks the position of the debouchment of a 

 powerful subglacial stream. 



Glacial Lake Bloomfield: Charles R. 



Dryer, Terre Haute, Indiana. 



Numerous deltas in the Honeoye and 

 Hemlock Valleys in Ontario and Living- 

 ston Counties, N. Y., at the 1,000-foot level 

 A. T., indicate the existence of an ice- 

 dammed lake which succeeded the glacial 

 Honeoye and Hemlock Lakes described by 

 Pairchild, and immediately preceding 

 Lake Warren. Its principal outlet was 

 across the divide eastward to the Bristol 

 Valley. A later and lesser outlet was 

 opened to the northeast near the village 

 of East Bloomfield. Two smaller spill- 

 ways to the west may have been briefly 

 active. The northern border of Lake 

 Bloomfield was formed by the margin of 

 the ice, when it stretched from the Gahyan- 

 dock Hills to the north end of a ridge three 

 miles west of Lima Village. 



The Loesses of the Mississippi Valley: B. 



Shimek, Iowa City, Iowa. 



Evidence was presented to the effect that 

 a loess deposit followed each drift sheet, 

 and that the loesses are inter- and post- 

 glacial. This conclusion is supported by 

 the vertical position of the loesses with 

 reference to the drift-sheets ; by geograph- 

 ical position, the best illustrations occur- 

 ring near the borders of drift-sheets; by 

 root- tubes; by fossils; by differences in 

 texture and composition. 



The Gases in Bocks: R. T. Chambeelin, 

 Chicago, 111. (Read by T. C. Chamber- 

 lin.) 

 Some of the results of 112 analyses of 



the gases derived from a wide range of 



