Lusk Shale Member: Difference between revisions

From ILSTRAT
Jump to navigation Jump to search
mNo edit summary
 
 
(3 intermediate revisions by the same user not shown)
Line 1: Line 1:
{{Editwithform}}
{{DISPLAYTITLE:Lusk Shale Member (abandoned)}}
__NOTOC__
{{Tree
{{Tree
|category1=Paleozoic Erathem
|category1=Abandoned Names
|category2=Pennsylvanian Subsystem
|category3=Absaroka Sequence
|category4=McCormick Group
|category5=Morrowan Series
|category6=Caseyville Formation
|category7=Shale
|tree1=McCormick Group
|tree1=McCormick Group
|tree2=Caseyville Formation
|tree2=Caseyville Formation
Line 17: Line 12:
}}
}}
==Primary source==
==Primary source==
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
Nelson, W.J., P.H. Heckel and J.M. Obrad, 2022, Pennsylvanian Subsystem in Illinois: Illinois State Geological Survey, Bulletin (in press).


==Contributing author(s)==
==Contributing author(s)==
M. E. Hopkins and J. A. Simon
W.J. Nelson


==Name==
==Name==


===Original description===
===Original description===
The Lusk Shale Member of the Caseyville Formation (Weller, 1940, p. 36).
Weller (1940, p. 35–36) introduced the unit as the Lusk formation (of the Caseyville group).


===Derivation===
===Derivation===
Named for Lusk Creek in Pope County.
The unit was named for Lusk Creek in Pope County, far southern Illinois.


===Other names===
===Other names===
[[Wayside Member]] (Lamar 1925) has priority over Lusk Member.


===History/background===
===History/background===
In early usage, the Lusk was classified both as a formation and as a cyclothem, the two being considered equivalent. Wanless (1956) listed the Lusk Formation containing the Wayside marine zone. When Kosanke et al. (1960) revised the Caseyville from a group to a formation and abandoned cyclothem-based formations, they changed the Lusk Formation to Lusk Shale Member in southeastern Illinois. Assigning the name Wayside Sandstone Member to equivalent strata in southwestern Illinois, these authors wrote (p. 29), “Like the Lusk Shale Member to the east, the Wayside Sandstone Member is a complex unit consisting of several beds of massive sandstone separated by silty shale. It probably includes strata equivalent to the Lusk Shale.”<br>
Describing strata of the Caseyville Formation in parts of Johnson and Pope Counties, Nelson et al. (1991, p. 18) wrote, “Mapping in progress demonstrates that the type [[Wayside Member|Wayside]] and the type Lusk are lithologically similar units of interbedded shale and sandstone and are stratigraphically equivalent. The name Lusk is therefore abandoned in favor of Wayside, which has priority [Lamar 1925].” This statement mirrors the passage from Kosanke et al. (1960) cited previously.


==Type section==
==Type section==
 
Weller (1940) did not designate a type section. Wanless (1956) listed outcrops in T12S, R5E and R6E and T13S, R6E, but no description has been published.
===Type location===
The type section consists of exposures along the creek north of Waltersburg (12, 13S-6E).
 
===Type author&#40;s&#41;===
 
===Type status===
 
==Reference section==
 
===Reference location===
 
===Reference author&#40;s&#41;===
 
===Reference status===
 
==Stratigraphic relationships==
The Lusk Shale member is the basal unit of the Pennsylvanian System in southeastern Illinois.
 
==Extent and thickness==
The thickness of the Lusk varies from zero to over 200 feet.
 
==Lithology==
The member is composed of various amounts of silty shale, siltstone, and sandstone. Quartz pebbles are common to abundant in some sandstone units as much as 25 feet or more thick, and these units are similar to the Battery Rock and Pounds Sandstone Members. Other sandstone units as much as 50 feet thick are fine grained. The Lusk contains a few thin, unnamed, nonpersistent coal seams and a few zones with marine fossils, most of them fragmentary. In general, all the Pennsylvanian rocks in southern Illinois below the Battery Rock Sandstone are assigned to either the Lusk Shale or the Wayside Sandstone.
 
==Core&#40;s&#41;==
 
==Photograph&#40;s&#41;==
 
==Contacts==
 
==Well log characteristics==
 
==Fossils==
 
==Age and correlation==
 
==Environments of deposition==
 
==Economic importance==
 
==Remarks==


==References==
==References==
WELLER, J. M., 1940, Geology and oil possibilities of extreme southern Illinois: Illinois State Geological Survey Report of Investigations 71, 71 p.
* Kosanke, R.M., J.A. Simon, H.R. Wanless, and H.B. Willman, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey, Report of Investigations 214, 84 p., 1 pl.<br>
* Lamar, J.E., 1925, Geology and mineral resources of the Carbondale Quadrangle: Illinois State Geological Survey, Bulletin 48, 173 p., 3 pls.<br>
* Nelson, W.J., J.A. Devera, R.J. Jacobson, D.K. Lumm, R.A. Peppers, B. Trask, C.P. Weibel, L.R. Follmer, M.H. Riggs, S.P. Esling, E.D. Henderson, and M.S. Lannon, 1991, Geology of the Eddyville, Stonefort, and Creal Springs Quadrangles, southern Illinois: Illinois State Geological Survey, Bulletin 96, 85 p., 1 pl.<br>
* Wanless, H.R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey, Circular 217, 14 p.<br>
* Weller, J.M., 1940, Geology and oil possibilities of extreme southern Illinois: Illinois State Geological Survey, Report of Investigations 71, 71 p.<br>


{{Codes
{{Codes

Latest revision as of 16:34, 9 February 2022

Lithostratigraphy: McCormick Group >>Caseyville Formation >>Lusk Shale Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Morrowan Series
Allostratigraphy: Absaroka Sequence

Primary source

Nelson, W.J., P.H. Heckel and J.M. Obrad, 2022, Pennsylvanian Subsystem in Illinois: Illinois State Geological Survey, Bulletin (in press).

Contributing author(s)

W.J. Nelson

Name

Original description

Weller (1940, p. 35–36) introduced the unit as the Lusk formation (of the Caseyville group).

Derivation

The unit was named for Lusk Creek in Pope County, far southern Illinois.

Other names

Wayside Member (Lamar 1925) has priority over Lusk Member.

History/background

In early usage, the Lusk was classified both as a formation and as a cyclothem, the two being considered equivalent. Wanless (1956) listed the Lusk Formation containing the Wayside marine zone. When Kosanke et al. (1960) revised the Caseyville from a group to a formation and abandoned cyclothem-based formations, they changed the Lusk Formation to Lusk Shale Member in southeastern Illinois. Assigning the name Wayside Sandstone Member to equivalent strata in southwestern Illinois, these authors wrote (p. 29), “Like the Lusk Shale Member to the east, the Wayside Sandstone Member is a complex unit consisting of several beds of massive sandstone separated by silty shale. It probably includes strata equivalent to the Lusk Shale.”

Describing strata of the Caseyville Formation in parts of Johnson and Pope Counties, Nelson et al. (1991, p. 18) wrote, “Mapping in progress demonstrates that the type Wayside and the type Lusk are lithologically similar units of interbedded shale and sandstone and are stratigraphically equivalent. The name Lusk is therefore abandoned in favor of Wayside, which has priority [Lamar 1925].” This statement mirrors the passage from Kosanke et al. (1960) cited previously.

Type section

Weller (1940) did not designate a type section. Wanless (1956) listed outcrops in T12S, R5E and R6E and T13S, R6E, but no description has been published.

References

  • Kosanke, R.M., J.A. Simon, H.R. Wanless, and H.B. Willman, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey, Report of Investigations 214, 84 p., 1 pl.
  • Lamar, J.E., 1925, Geology and mineral resources of the Carbondale Quadrangle: Illinois State Geological Survey, Bulletin 48, 173 p., 3 pls.
  • Nelson, W.J., J.A. Devera, R.J. Jacobson, D.K. Lumm, R.A. Peppers, B. Trask, C.P. Weibel, L.R. Follmer, M.H. Riggs, S.P. Esling, E.D. Henderson, and M.S. Lannon, 1991, Geology of the Eddyville, Stonefort, and Creal Springs Quadrangles, southern Illinois: Illinois State Geological Survey, Bulletin 96, 85 p., 1 pl.
  • Wanless, H.R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey, Circular 217, 14 p.
  • Weller, J.M., 1940, Geology and oil possibilities of extreme southern Illinois: Illinois State Geological Survey, Report of Investigations 71, 71 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
3960
--