Correspondence. 203 
reach elevations A. T. of 450 or perhaps 475 feet. In one case, that of 
the Androscoggin river, the fiuviatile delta plainly extends from the old 
elevated shore line all the way down to sea level. As far into the inte- 
rior as the fossiliferous marine clays extend, this fiuviatile delta overlies 
them. In the other valleys the raised fiuviatile deltas seem to end 
twenty or more miles north of tide water. At least, if they were origi- 
nally deposited continuously to the present shore, they were so narrow 
in the coast region that they have either disappeared by erosion, or have 
become so merged in the flood plain and recent deposits as not readily 
to be distinguished. 
The great transporting power of the glacial streams is attested by the 
belt of marginal kames and overwash aprons found along the margin of 
the ice-sheet for 2,000 miles or more. Analogy requires us to postulate 
a corresponding body of glacial sediments on the floor of the gulf of 
Maine, more or less mixed with berg droppings and with till deposited 
during re-advances of the ice. Excluding these, I infer that the sub- 
marine glacial sediments formed during the final retreat of the ice 
closely resemble the glacial marine deltas that have since been elevated 
above the sea for our inspection. Geo. H. Stone. 
Colorado Springs, Aug. 8, 1893. 
The Hamilton Beds of Callaway Co., Mo. On the 10th of June 
in company with Mr. D. K. Greger of Fulton, Mo., we visited a very in- 
teresting outcrop of Hamilton rocks, about seven miles southeast of 
the county seat of Callaway. 
Along a small creek we found an exposure of sandy shales over a 
quarter of a mile in length and twenty -five feet in hight, the lowest 
five or six feet being very sandy, blue, and crowded with brachiopods, 
corals and bryozoa. 
Upwards the beds become yellowish (partly due to exposure), less 
sandy, and disintegrate into a yellow clay. 
An Orthoceras, a Pleurotomaria? ', a Naticopsis?, a Euomphalus and 
two or three large lamellibranchs (all internal casts), occur at the base 
of the exposure, along with Stropheodonta navalis, S. cymbiformis, S. 
subcymbiformis, S. kemperi, S. inflexa, S. altidorsata, S. boonensis, 
S. callawayensis, S. quadrata, S. uquicostata, a small Productella, a 
Cyathophyllum, a Monticulipora, an Alveolites?, two species of 
Aulopora, bryoza, and a coral- like sponge(?). 
From the middle layers were obtained a large fine Spirifera like 
eurutines, Spiriferina ann;r, Cyrtia missouriensis, C. occidentalis, 
Orthis iowensis, Streptcrhynchus chemungensisi ?), Productella cal- 
lawayensis, Stropheodonta sp?, two species of Cr ania, Atrypa reticu- 
laris, Spirorbis sp., Cormdites sp?; while from a horizon still higher 
in the exposure were collected a large variety of Atrypa reticularis, 
Orthis iowensis, and the Spirifera like eurutines. 
Two crinoids, a Melocrinus and a Taxocrinus, are, perhaps, confined 
to the middle and upper beds, although stem joints and short columns 
occur throughout the depth of the outcrop. 
