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Observations on Some Details of Wave Erosion: Wave Furrows and Shore Potholes

The conclusion is drawn that the aggregate activity of small wave erosion, lost sight of in the startling effects of violent wave work, may be of great importance especially in regions of low storm frequency.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

Estimates of Marine and Fluvial Erosion in Hawaii

The remarkably symmetrical conic surfaces of various parts of Hawaii, now somewhat carved by marine and fluvial agencies, are made the basis of estimates of marine and fluvial erosion. A rate relationship between the two is deduced.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

Concerning the Differentiation of a Lamprophyric Magma at Corbaley Canyon, Washington

Evidence is presented to prove that the dike rocks of Corbaley Canyon represent a series of intrusions injected at intervals during the differentiation of an original lamprophyric magma.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

The Relative Effectiveness of Bacteria as Agents of Chemical Denudation

Data are presented that represent the results of a series of experiments conducted in an attempt to measure in quantitative terms the rôle of bacteria as agents of chemical weathering.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

Granodiorites in the Pend Oreille District of Northern Idaho

A detailed account is given of the occurrence and the mineral and chemical composition of the granodiorites found in the Pend Oreille district, Bonner county, Idaho. The study of the minerals of which these rocks are composed brought out some facts of general application.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

The Origin and Occurrence in Rockbridge County, Virginia, of So-Called "Bentonite"

Certain strata found south of Lexington, Rockbridge County, Virginia, in the upper part of the Liberty Hall formation of late Middle Ordovician age have been interpreted as "bentonite" and of volcanic origin.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

Fault Troughs

Fault troughs may be classed as superficial or profound. Superficial fault troughs result from (1) earthquakes, or (2) volcanic activity, or (3) tension. Tensional fault troughs are due to differential uplift, rotational strain, or the tilting of large fault blocks.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

A Syntectic Porphyry at Porcupine

As an answer to the question "What would be the effect upon the wall rocks if a granodiorite magma rich in superheat, alkali, and silica were to be injected into highly foliated meta-andesite schists which are saturated with ground water, the injection taking place in the hypabyssal region?

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

Formation of Clay Balls

Spherical masses of clay, "clay balls," are produced under certain conditions by the action of water, and, as such, have been found fossilized. In some cases, accretion seems to be the chief factor in their formation; in others, a wearing away of the projecting parts.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘

Block-Faulting in the St. Croix Valley

The recent discovery of a block-fault with vertical displacement of several hundred feet in the rarely disturbed Paleozoic rocks of the Upper Mississippi Valley is reported, and the faulted area described. The age of the faulting is problematical.

出版机构:University of Chicago

刊物名称:The Journal of Geology

出版时间:1927

ISSN:0022-1376

数据源:报刊文摘