Nebraskan and Kansan Stades: Complexity and Importance

Dort, Wakefield

doi:10.1126/science.154.3750.771

“…There is no evidence that later Illinoian and Wisconsinan advances ever reached as far south as Kansas and Missouri. Bayne (1968) and Dort (1965Dort ( , 1966Dort ( , 1985 described several tills in northeastern Kansas (Fig. I), suggesting a more complex record similar to that of pre-Illinoian glacial deposits in Iowa and Nebraska (Boellstorff 1973;Hallberg 1980Hallberg , 1986.…”

Section: Previous Workmentioning

confidence: 96%

Early middle Pleistocene glacial sediments (780000‐620000 BP) near Kansas City, northeastern Kansas and northwestern Missouri, USA

Colgan

¹

1999

Boreas

View full text Add to dashboard Cite

Colgan, P. M. 1999 (December): Early middle Pleistocene glacial sediments (780 000-620 OOO BP) near Kansas City, northeastem Kansas and northwestern Missouri, USA. Boreas, VoI. 28, pp. 477489. Oslo. ISSN Two lithologically distinct tills are present near the pre-Illinoian glacial boundary in northeastern Kansas and northwestern Missouri. The tills are probably early middle Pleistocene (780 000-620 OOO BP) based on normal polarity and their stratigraphic relationship to dated terraces. The upper till is sandier than the lower till and contains more expandable clay minerals and less illite than the lower till. Glaciofluvial and supraglacial sediments are preserved between the tills, yet palaeosols, or other evidence of an interglacial, are not present, suggesting that the tills were deposited during a single glaciation. Southeasterly and southwesterly trending striae and till fabric suggest that the glacial succession was deposited by at least two fluctuations (phases) of a lobe, which probably advanced down the axis of the present Missouri River lowland. These tills probably correlate to early middle Pleistocene tills in southwestern Iowa and eastern Nebraska, although it is possible that the lower till may correlate to even older tills in these areas.BOREAS 0300-9483.

show abstract

“…Early studies identified two tills north of Kansas City, which were assigned a Nebraskan and Kansan age based on stratigraphic position and relation to palaeosols. Bayne (1968) and Dort (1965Dort ( , 1966Dort ( , 1985 described several tills in northeastern Kansas (Fig. There is no evidence that later Illinoian and Wisconsinan advances ever reached as far south as Kansas and Missouri.…”

Section: Previous Workmentioning

confidence: 99%

Early middle Pleistocene glacial sediments (780 000-620 000 BP) near Kansas City, northeastern Kansas and northwestern Missouri, USA

Colgan¹

1999

SBOR

14

0

View full text Add to dashboard Cite

Colgan, P. M. 1999 (December): Early middle Pleistocene glacial sediments (780 000-620 OOO BP) near Kansas City, northeastem Kansas and northwestern Missouri, USA. Boreas, VoI. 28, pp. 477489. Oslo. ISSN Two lithologically distinct tills are present near the pre-Illinoian glacial boundary in northeastern Kansas and northwestern Missouri. The tills are probably early middle Pleistocene (780 000-620 OOO BP) based on normal polarity and their stratigraphic relationship to dated terraces. The upper till is sandier than the lower till and contains more expandable clay minerals and less illite than the lower till. Glaciofluvial and supraglacial sediments are preserved between the tills, yet palaeosols, or other evidence of an interglacial, are not present, suggesting that the tills were deposited during a single glaciation. Southeasterly and southwesterly trending striae and till fabric suggest that the glacial succession was deposited by at least two fluctuations (phases) of a lobe, which probably advanced down the axis of the present Missouri River lowland. These tills probably correlate to early middle Pleistocene tills in southwestern Iowa and eastern Nebraska, although it is possible that the lower till may correlate to even older tills in these areas.BOREAS 0300-9483.

show abstract

“…The simple two-till, one-ash stratigraphy for Kansas and adjacent states began to unravel during the 1960s and 1970s with discovery of multiple till units representing more than two glacial advances (Reed & Dreeszen 1965;Reed et al 1965;Dort 1966;Bayne 1968;Boellstorff 1978a;Easterbrook & Boellstorff 1981). New stratigraphic names and type sections were designated in Nebraska and Kansas by Reed & Dreeszen (1965), and new long-distance correlations were proposed between Kansas and regions to the north (Bayne et al 1971).…”

Section: Revision Of Glacial Stratigraphymentioning

confidence: 99%

“…(1971), and Aber (1985a) recognized three till units. Dort (1966Dort ( , 1985 interpreted five episodes of glacier advance at one site in Doniphan County; interpretation of this site is problematic, however, because of repetition in the section due to ice thrusting. Confusion is evident in terminology and varying interpretations.…”

Section: Lithostratigraphy Of Glacial Deposits In Kansasmentioning

confidence: 99%

The glaciation of northeastern Kansas

Aber

¹

1991

Boreas

View full text Add to dashboard Cite

The traditional pre‐Illinoian glacial stratigraphy in the central United States has been abandoned, which leaves a void in the Pleistocene stratigraphy of Kansas. The Independence Formation is proposed as a tithostratigraphic unit in northeastern Kansas. The Independence Formation consists of all diamictons and stratified sediments interbedded with diamictons. The Independence Formation vanes greatly in thickness and texture, but it always contains erratics derived from the Canadian Shield. At least two glacial advances took place in northeastern Kansas, first by the Minnesota lobe coming from the northeast, and later by the Dakota lobe from the northwest. During the first advance, glacial Lake Atchison was dammed in a now‐buried valley. Overflow from this lake cut spillways that form parts of the Blue, Kansas, and Missouri valleys. During the later ice advance, the Kansas valley was blocked, and temporary lakes formed, from which catastrophic flooding took place. The age of the Independence Formation is interpreted as 0.7 to 0.6 million years BP. It is considered equivalent in age and stratigraphic position to type A2 and A3 tills of Nebraska and western Iowa and to the McCredie Formation of northern Missouri. This age range corresponds to oxygen‐isotope stages W16.

show abstract

Nebraskan and Kansan Stades: Complexity and Importance

Cited by 12 publications

References 1 publication

Early middle Pleistocene glacial sediments (780000‐620000 BP) near Kansas City, northeastern Kansas and northwestern Missouri, USA

Early middle Pleistocene glacial sediments (780000‐620000 BP) near Kansas City, northeastern Kansas and northwestern Missouri, USA

Early middle Pleistocene glacial sediments (780 000-620 000 BP) near Kansas City, northeastern Kansas and northwestern Missouri, USA

The glaciation of northeastern Kansas

Contact Info

Product

Resources

About