Sigourney Deep Well

During the summer of 1888 a deep well was drilled at Sigourney, in Keokuk County. Captain Parker, who was at that time mayor, carefully preserved samples of the different strata passed through. These samples have recently been re-examined, and form the basis of the following notes. While the unreliability of records derived from the ordinary or churn drill is fully recognized, it is believed that the care with which these samples were selected and preserved, at least considerably reduces that element of doubt. Previous accounts of this record have been published in the local newspapers, and re-published by C. H. Gordon in the American Geologist. Recent studies in the region, as well as a revision of the material, give, however, considerable information not available at that time

Mississippian Rocks of Central Iowa

The Mississippian series includes all the rocks lying between the base of the coal measures and the top of the Devonian. They have been principally studied in southeastern Iowa and adjacent portions of neighboring states. More recently the study of the exposures of that portion of central Iowa which includes Marion, Mahaska, Keokuk, and Washington Counties has allowed the construction of a central Iowa section

Preglacial Elevation of Iowa

The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of the glaciers has left in this state no record in deposits. Its history must be gathered entirely from the land forms then created, and from inferences drawn from orographic changes known to have taken place in other regions

Proceedings of the Fourteenth Annual Session of the Iowa Academy of Sciences: Staff & Committee Reports

The fourteenth annual session of the Iowa Academy of Sciences was held in the state horticultural rooms at the capitol building in Des Moines, December 26, 27 and 28, 1899. In business sessions the following matters of general interest were passed upon

The Aftonian and Pre-Kansan Deposits in Southwestern Iowa

he Aftonian deposits of southwestern Iowa have peculiar interest in that within the area is the type locality for the Aftonian. So far neither the drift of the region nor the Aftonian as a unit has received a general discussion. The references to the beds extant are merely incidental to broader studies. The type locality and several other critical exposures have been visited by many geologists but no one has presented a complete account of the beds in question

Structure of the Mystic Coal Basin

The lower measures of the Iowa-Missouri coal field consist of a series of sandstones, shales, fire clays and coal beds, which have been found to interlock in a characteristically irregular manner. The different individual beds have, with rare exceptions, only a limited extent, and frequently grade into each other in a mariner making their stratigraphy quite complex. This variability has been recognized by many workers and has recently been elaborated so fully that only a reference is necessary in this connection

Interloessial Till near Sioux City, Iowa

Till and loess are well known deposits and need not be defined. It is a peculiar and anomalous relation between the two which it is proposed to describe in this paper. It is well known that the till almost universally occupies a position below the loess wherever the two are found in the same section. A few cases only have been noted where the reverse is true. Such an instance was described by McGee and Call in an account of the loess near Des Moines. Similar occurrences have been reported by other observers from central and eastern Iowa. These may all be readily explained by an advance of the ice sheet over the loess already deposited around its margin