ic)2 The American Geologist. March, i9co 
CORRESPONDENCE. 
Appendix TO A NOTE ON THE San Jacinto Earthquake. Since 
writing the notes published in the February number, a young man has 
told me the following experience. He was out with some companions 
duck-hunting on lake Elsinore, a few miles south of Mt. San Jacinto. 
They were on a long narrow spit of sand projecting into the lake for 
nearly a mile and only a few inches above the water when a sudden 
commotion among the ducks caused one of the party to ask what was 
the matter. Before the question could be answered came the quake 
and the water immediately rose on the sand causing them some alarm. 
They immediately started for the main-land but before they could reach 
it the spit was flooded and they were ankle-deep in water. The wave 
caused by the vibration must have been at least twelve inches in hight. 
E. W. Claypole. 
An Exajmple of Wave-formed Cusp at Lake Geokge, N. Y. 
Having in mind ths recent p-ipers in this magazine by professors Tarr 
and Woodman upon the agency of waves in forming cuspate forelands, 
what seems a most interesting case of such action came to my notice in 
the summer of 1898 on lake George, N. Y. 
At Hague there enters lake George from the west one of the 
largest mountain brooks flowing into the lake. This stream, Hague 
brook, has a length of some six miles and a fall of nearly fourteen 
hundred feet in that distance. Its course is for the most part over 
the Laurentian rock of the region, with two or three glacial deposits 
in its valley, noticeably those near its mouth. 
The rapid fall of the stream and the steep slope of its watershed 
give rise to a torrential flow after very heavy rain, and much ma- 
terial is thus brought down to form a fine example of delta-formed 
cusp at the mouth of the brook. This delta is some quarter of a 
mile wide at its base and extends possibly half that distance out into 
the lake. It is surrounded by a shelf, in some places a hundred feet 
or more in width, formed of similar material to that of the delta it- 
self. The water on this shelf is shallow, varying from a few inches 
at the shore to two or three feet at its outer edge where the descent 
is very abrupt to a depth of twenty or thirty feet. The level plain 
of this delta makes a very strongly marked contrast with the ordinar- 
ily precipitous shores of the lake. 
Whilf walking along the outer edge of this delta, I noticed with 
interest a small blunted cusp-shaped bar rising above the surface of 
the water at some distance to one side o.f the mouth of the stream and 
enclosing a small lagoon, while from the front angle of this cusp a 
straight bar some few inches under water and possibly two feet wide 
ran directly out upon the surrounding shelf for a distance of perhaps 
thirty feet. The cusp itself at the base may have been thirty or forty 
feet wide and projected some twenty feet into the water. 
