A Diagonal Moraine. — Plummer. 231 
discussion. This question was : What are the Principles and 
Criteria to be observed in the Correlation of Glacial Forma- 
tions in Opposite Hemispheres? In part, however, it had 
been under consideration by most of the foregoing contrib- 
utors and speakers, the general view of all being that the 
glaciations of Europe and North America were essentially 
contemporaneous and much alike. 
A DIAGONAL MORAINE. 
By Fred. G. Plummer, Tacoma, Wash. 
Among many interesting discoveries made during a recent 
exploring trip to the craters of Mt. St. Helens, in the state of 
Washington, one in particular seems to me so unusual as to 
call for special mention. 
Our route contoured the north flank of the mountain, 
crossing many lateral and several recent terminal moraines. 
The glaciers were small at this elevation and were insignifi- 
cant compared with those upon the mountain proper. Climb- 
ing over a low lateral moraine, I found between it and a 
higher moraine that formed a spur of the mountain, a small 
glacier with the typical wavy surface and without crevasses. 
Its inclination was twenty degrees. 
Upon its surface, crossing the glacier diagonally from south- 
east to northwest, was a small moraine. It was perfectly 
straight and regular in form, about 300 feet long, 20 feet wide 
at the base, 5 feet high and with a slightly convex crown of 
about four feet. It resembled an unfinished railroad grade 
and was strikingly different from all of its surroundings. 
Upon careful examination I found it to be composed of the 
same rocks as other moraines but with this difference, that 
they were more worn and rounded and all of much smaller and 
more uniform size. At the foot of the side slopes the line of 
demarcation was cleaner and better defined than that of any 
other moraine I have observed. At its upper end or source 
(?) it abuts against an old lateral moraine which was pos- 
sibly a portion of the former terminal moraine of a higher and 
larger glacier. At this point there was the sound of running 
water which probably came from a snow field above and 
made its way through the rocks without showing upon the 
