Willard Shale

Willard Formation
Willard Shale
Stratigraphic range: [1]Gzhelian
↓
 (Virgilian stage)[2]
TypeFormation
Unit ofWabaunsee Group
UnderliesZeandale Limestone
OverliesEmporia Limestone
Lithology
PrimaryArgillaceous shale
OtherThin arenaceous shales, sand
Location
RegionKansas
CountryUnited States
Type section
Named forWillard, Kansas[3]
Named byBeede[3]
Year defined1898[3]

The Willard Formation, also referred to as Willard Shale, is a Late-Carboniferous geologic formation in Kansas, extending into Nebraska, Iowa, Missouri, and Oklahoma.[2][1]

The full face of the formation is exposed for easy access on the north bank of Deep Creek at the public park, Pillsbury Crossing, in southeast Riley County, Kansas,[4] about 25 miles (40 km) west of the type location at Willard, Kansas.[3]

  1. ^ a b P. H. Heckel (2013). "Pennsylvanian stratigraphy of Northern Midcontinent Shelf and biostratigraphic correlation of cyclothems". Stratigraphy. 10 (1–2): 7, TEXT-FIGURE 4. Retrieved 2024-06-02.
  2. ^ a b "Geologic Unit: Willard". National Geologic Database. Geolex – Significant Publications. United States Geological Survey. Retrieved 2024-06-02.
  3. ^ a b c d Jewett, John M. (1941). The Geology of Riley and Geary Counties, Kansas, Kansas Geological Survey Bulletin 39. University of Kansas Publications, State Geological Survey of Kansas. The Willard formation, named from a village in Shawnee County, Kansas, was differentiated by Beede in 1898. In some reports of the Kansas Geological Survey an error in correlation of units appears, but the Willard is now recognized as the shale between the Elmont and Tarkio limestones.
  4. ^ Jewett, John M. (1941). The Geology of Riley and Geary Counties, Kansas, Kansas Geological Survey Bulletin 39. University of Kansas Publications, State Geological Survey of Kansas. Distribution--This shale is exposed in a small area on both sides of Deep Creek in southeastern Riley County. It can easily be seen at Pillsbury Crossing ....