Lithic Type Specimen: OJCU-4 (Ordovician Jefferson City-Cotter Undifferentiated, Variety 4)
date: label: Accession Date
content: 30 Aug 2012
label: Collection Date
content: 1970 to 1990
name: label: Collector
content: Don R. Dickson
label: Donor Name
content: Don R. Dickson
notes: label: Notes
content: OJCU-4 (Ordovician Jefferson City-Cotter Undifferentiated, Variety 4): Found in the Mountain Home area of Arkansas. A dark gray to almost black ground is streaked in places with lighter medium gray. Texture varies from fine and vitreous (in the almost black areas) to medium coarse (in the banded or streaked). Some of the black or dark gray resembles Pitkin chert. The streaked portions tend to be more fractured than the solid dark dolomite. Weathers to a tan or brown. A fairly scarce variety.
label: Notes
content: JEFFERSON CITY. The Jefferson City formation is found on the surface throughout the southern half of Missouri, except in the extreme southeast and in the western counties (except McDonald & Barry, where limited amounts occurr). Over much of this area the Jefferson City and Cotter are not differentiated because the lithiologies are similar and often thin. In many cases the mottled and irregularly banded Jefferson City dolomite cannot be separated from from similarly marked Cotter. A careful microscopic examination reveals few distinguishing differences, so these are best left undifferentiated. The following two varieties seem to be clearly associated with the Jefferson City formation.
label: Notes
content: Jefferson City-Cotter
label: Record Last Modified
content: 22 Jun 2022
label: Specimen Count
content: 1
place: label: Place
content: Boone County, Arkansas, 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: 2060436
label: USNM Number
content: A587208-0
objectType: label: Object Type
content: Stone