Cunningham Township in Urbana in Champaign County, Illinois — The American Midwest (Great Lakes)
Cyclothems
Photographed By Duane and Tracy Marsteller, May 28, 2023
1. Cyclothems Marker
In 1932, Harold R. Wanless introduced the term cyclothem to describe the succession of sedimentary rock layers found in coal-bearing formations. The understanding of cyclothems remains an indispensable tool for predicting the location of coal deposits and for defining the processes by which sea levels change.
Erected by University of Illinois.
Topics and series. This historical marker is listed in these topic lists: Environment • Science & Medicine. In addition, it is included in the University of Illinois series list. A significant historical year for this entry is 1932.
Location. 40° 6.543′ N, 88° 13.57′ W. Marker is in Urbana, Illinois, in Champaign County. It is in Cunningham Township. Marker can be reached from South Mathews Avenue, 0.1 miles south of West Green Street, on the right when traveling south. Marker is on the south side of the Natural History Building, near the Woolly Mammoth statue. Touch for map. Marker is in this post office area: Urbana IL 61801, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Illite and Clay Mineralogy (within shouting distance of this marker); Understanding Photosynthesis (about 300 feet away, measured in a direct line); Natural History Building (about 300 feet away); Former Site of the University of Illinois College of Medicine at Urbana-Champaign
this page online
Also see . . .
1. Cyclothems. Wikipedia entry (Submitted on August 7, 2023, by Larry Gertner of New York, New York.)
2. Harold R. Wanless. University of Illinois website entry:
During his 44-year career at the University of Illinois, Wanless taught physical geology, vertebrate paleontology, sedimentology, sedimentary petrology, and a meticulous course on field geology and geological maps. In addition, he was founder of the first University of Illinois Geology Field Camp and was its director from 1944 to 1951. (Prairie Research Institute, Illinois State Geological Survey) (Submitted on June 12, 2023, by Duane and Tracy Marsteller of Murfreesboro, Tennessee.)
via Friday Fold, unknown
2. Carboniferous cyclothems at Scremerston, Northumberland
via University of Illinois, unknown
3. Harold R. Wanless
Photographed By Duane and Tracy Marsteller, May 28, 2023
4. Cyclothems Marker
Marker is by the tree on the right.
Credits. This page was last revised on August 7, 2023. It was originally submitted on June 8, 2023, by Duane and Tracy Marsteller of Murfreesboro, Tennessee. This page has been viewed 60 times since then and 12 times this year. Photos: 1. submitted on June 8, 2023, by Duane and Tracy Marsteller of Murfreesboro, Tennessee. 2, 3. submitted on August 7, 2023, by Larry Gertner of New York, New York. 4. submitted on June 8, 2023, by Duane and Tracy Marsteller of Murfreesboro, Tennessee.
