212 The A'luei'ican (icologDit. March, is'js 
spoken of in treating of the drift phenomena of Long Island, that 
where the frontal moraine is broken, these southern kames become 
more prominent, and these gaps always occur in the moraine where 
the streams come up from the north. In places there will be only a 
line of kettle-holes to mark the ancient line of drainage, and in other 
places as at Hempstead the moraine is nearly swept away. The old 
channels are always visible south of the ridge, but the depressions 
are mostly dry until nearing the bays on the south, where they are 
kept open by the tides or are fed l)y springs like the Seatuck river 
which Hows into Moriches bay. This river is only about a mile in length, 
yet the old channel is traceable to the front of the moraine nearly 
four miles distant. 
I mention these facts as they may tend to throw some light on the 
formation of both islands, for it seems to the present writer that the 
surface portions at least are all one as to time and origin. 
Professor Shaler has observed very closely, but he has failed, I, 
think, to fully understand the imports and connections of the old sub- 
glacial currents with the mainland, and their effect on the contour of 
the whole Island, for. studied in this light, I cannot see how any one 
can conjecture that any disturbance has taken place in postglacial 
or interglacial times, or that the sea held sway over any part of the 
Island during the deposition of the glacial detritus. 
Jutsfpnrf. I.. /.. .V. )'.. Xor. iU, 1S!>..\ .JoHX BrysoX. 
1\i:m AKKs o\ A iv\i:t of Tuiv i!i:vii;\v or riii; Tnn;i) Texas Kei'okt. — 
Although I was not connected in any way with the review of the Third 
Annual Report of the Geological Survey of Texas, published in the 
November number of Tnic Amekicax Gkolochst, pp. 311-313, I beg the 
permission to say. that it is a fair and exact exposition of the Third 
Texas Report, and I fully indorse what the reviewer said at)out the 
geology of Tucumcari and Pyramid mount. 
Mr. Hobt. T. Hill's letter published in the December number, pp. 
333-334, contests the statement that*my "determination of the Jurassic 
age of the Tucumcari beds in New Mexico has been sustained by Capt. 
(,'. E. Dutton. Prof. A. Hyatt and himself, and opposed by Prof. .las. 
Hall and Dr. .1. S. Newberry ;" and he goes so far as to protest against 
the use of tliose names "in a manner unauthorized" by Messrs. Dut- 
ton, Hyatt and himself. 
Major Dutton iuis used my determination of the .Jurassic in New 
Mexico, on the /nni plateau and round mount Taylor, based on the 
discovery I made lirst jit the Tucumcari region, and carried westward 
thrtmgh the valley of the Kio Grande. The same area west of the 
Kio(;rande surveyed by me in 1853, was resurveyed several years 
after by :\lessrs. Newberry and Gilbert ; and both published geological 
mai)s. entirely devoid of the .lurassic formation. So in that part of 
New Mexico. majt)r Dutton has sustained my determination of the 
Jurassic, as I first found it at the Tucumcari. No authorization is 
wanted to allow any one to quote the paper of major Dutton. 
