AMERICA. 119 



The author accounts for the apparent absence of all roots &c. in 

 these underclays by analogy with what is now going on in the Cypress- 

 swamps and elsewhere. He holds that there is no foundation for the 

 beUef that these Lignite-beds were formed of drifted materials. G. A. L. 



HiTcncocK, Prof. C. H. Geological History- of the Winnipiseogeo 

 Lake. Proc. Amer. Assoc, vol. xxii. B. pp. 120-131. 



The periods in the history of this lake-basin are thus divided : — ■ 

 1. Period of the deposition of the Porphyritic Gneiss or Granite. 2. 

 AVinnipiseogee-Lake Gneiss Formation. 3. White-Mountain Series. 



4. Elevation and Metamorphism of first three groups. 5. Eruption of 

 the Granites of the Ossipee 3iEountains. 6. Deposition of Felsites or 

 Compact Felspars. 7. Eruption of Syenite. 8. Deposition of Mica- 

 schist. 9. Glacier Period. 10. Terrace Period. G. A. L. 



. Note upon the Cretaceous Strata of Long Island. Proc. 



Amer. Assoc, vol. xxii. B. pp. 131, 132. 



The writer reasserts the correctness of his views in marking certain 

 rocks on the northern side of Long Island, in his map, as Cretaceous. 

 Cretaceous fossils lately found there seem to place the matter beyond 

 doubt. ' G. A. L. 



. The Geology of Portland [Maine]. Proc. Amer. Assoc. 



vol. xxii. B. pp. 163-175 (1 fig. in text). 



A sketch of the geology of the district. The older rocks are described 

 under the heads Gneiss and Granite, Huronian System, and Cambrian. 

 The Post-Tertiary Deposits are more fully considered, their succession, 

 in the author's opinion, being as follows : — 1. Glacier Period : country 

 covered with a sheet of ice, pushing towards the ocean and carrying 

 boulders. 2. Leda Clay : submergence to the depth of 40 or 50 feet. 



5. Saxicava Period : Littoral Fauna. 4. Terrace Period : submer- 

 gence. Nos. 1 and 3 together form the Champlain Period, a list of the 

 fossils found in the beds of which is given. G. A. L. 



. Geology of the North-west Part of Maine. Proc. Amer. Assoc. 



vol. xxii. B. pp. 205-214 (map in text). . 



Draws the following conclusions from the distribution of the forma- 

 tions in N.W. Maine : — 1. " The Oriskany sandstone reposes gently 

 upon Eozoic gneisses." " It can be no longer maintained with reason 

 that these strata pass into New Hampshire in a metamorphosed condi- 

 tion." 2. "The Oriskany is several times thicker than in its extension 

 in the interior and further south in Pennsylvania." 3. " The discovery 

 of new localities of Helderberg Limestone indicates a widespread 

 submergence of Eastern America, in Upper Silurian and ^Middle Devo- 

 nian times, of nearly 1500 feet." 4. "There must have been, subse- 

 quently to the Helderberg, a period of elevation to bring Now England 

 to essentially its present position." G. A. L. 



. On Helderberg Hocks in New Hampshire. Amor. Journ. 



ser. 3, vol. vii. pp. 468-476, 557-671, 11 figs, and 1 map. 



