Bailey (AKA Grassy Knob) Chert
date: label: Accession Date
content: 29 Dec 2016
label: Collection Date
content: Nov 1995
name: label: Collector
content: Robert Nale
label: Donor Name
content: Estate Of John D. Holland
notes: label: Notes
content: L-1288 (Bailey Chert): Collection includes raw material, outer surface, and naturally-weathered specimens.
label: Notes
content: L-1288 (Bailey Chert): Bailey L/S Formation; Devonian; #11-35.
label: Notes
content: Bailey Chert, also known as Grassy Knob, Blair, and St. David, is a fine grained chert. It is white to gray, blue-gray, dark green, tan or blue-black in color. It becomes a reddish-brown color when heat-treated. It may have fossiliferrous inclusions. Deposits include small often highly fractured nodules and blocky lenses, siliceous, cherty limestone, and locally weathered to chert gravel and silica. SEE ALSO: BLAIR CHERT
label: Notes
content: Geology remarks: Epoch- Devonian, Form- Bailey Limestone
label: Notes
content: Location remarks: Crops out extensively in and adjacent bluffs of Mississippi River in western Union and northern Alexander counties, Illinois; Western Jackson, Alexander, and Union counties, T15Sm R3W, Sect. 5
label: Notes
content: Archaeology remarks: Very limited use prehistorically because of small size and close proximity to preferred Cobden and Kaolin.
label: Record Last Modified
content: 22 Nov 2019
label: Specimen Count
content: 2
place: label: Place
content: Illinois, United States, North America
topic: label: Topic
content: Archaeology
setName: label: See more items in
content: Anthropology
dataSource: label: Data Source
content: NMNH - Anthropology Dept.
identifier: label: Accession Number
content: 2071475
label: USNM Number
content: A598215-0
objectType: label: Object Type
content: Stone