Marine resources and ocean surveys

Application of ERTS-1 remotely sensed multispectral imagery to marine resources and oceanic observations and surveys - Conferenc

Notes on the Geology of the Boston Basin

The region about Boston forms a basin. Standing on the reservoir at College Hill one looks north, west and south upon lines of hills surrounding Boston and the thickly populated adjoining country. In the relation of the rocks underlying the drifts this region also forms a basin. The distant hills are of hornblende granite extending from near Marblehead southwest to near south Natick, thence east toward Quincy. Close to this granite area are other igneous rocks, and within the basin, conglomerate and slate so related and concealed by drift as to present many difficult problems

Results of Recent Geological Work in Madison County

It is intended in this paper to state briefly some of the geological features of Madison County as observed during the past summer. For a more detailed description, reference may be made to the complete report in the next volume of the \u27\u27Iowa Geological Survey

Origin of the Present Drainage System of Warren County

Synopsis: First - In Warren County the drift is of uneven depth. As in other drift areas, this unevenness is not dependent entirely on the pre-glacial surface. In the unconformity of the drift on this pre-glacial surface a relation is seen indicating a similarity between the present drainage system and the pre-glacial drainage system. Second - The present river valleys and larger ravines are larger than present streams require. They fit into the pre-glacial valleys. Third - ln the smaller ravines only do we find erosion without regard to the pre-glacial configuration of the county

The Area of Slate Near Nashua, N.H.

Crosby\u27s map of eastern Massachusetts represents an area of slate, or argillite, as it is termed, running from Worcester through Lancaster and Pepperell to the New Hampshire state line. The eastern part of this argillite, two and one-fourth miles wide on the map, but four miles wide according to the text, continues north into New Hampshire just west of the Nashua River. On the east of the argillite lies mica schist in an area very narrow (three-fourths of a mile) near the state line, but much wider toward the southern part of the township of Dunstable. On the west of the argillite lies gneiss close to the state line, but mica schist a little farther southwest (in Townsend)

Strata between Ford and Winterset

[The following article was accompanied by a series of diagrams representing the size, location, and relative position of the various out-crops.] Middle River rises on the eastern slopes of the divide in Adair and Guthrie Counties. It flows just south of Winterset, in Madison County, then northeasterly to the northeast corner of Warren County, where it takes an easterly direction for four miles and flows into the Des Moines River, about eight miles below the city of Des Moines. Consequently, a line drawn along Middle River from its mouth to Winterset, a distance of about fifty miles, passes from close to the lower strata of what White calls the Middle Coal Measures, across the entire series of both the Middle and Upper Coal Measures. In the sections found along this line we may ascertain the local thickness of the different strata, some facts in regard to the continuity of the different strata and of the different seams of coal, also the position of the border between the Middle and Upper Coal Measures; or between the Lower and Upper Coal Measures, following the classification that will probably be accepted