South Mountain Metarhyolite
date: label: Accession Date
content: 29 Dec 2016
label: Collection Date
content: 18 Jun 1998
name: label: Collector
content: J. D. Holland
label: Donor Name
content: Estate Of John D. Holland
notes: label: Notes
content: L-1510 (South Mountain Metarhyolite): Provenience includes prehistoric quarry. Collection includes raw material, outer surface, surrounding matrix, archaeological specimens, and naturally-weathered specimens.
label: Notes
content: L-1510 (South Mountain Metarhyolite): Only one or two specimens show outer cortex (surrounding matrix) & outer surface.
label: Notes
content: South Mountain Metarhyolite is also known as Catoctin, Caledonia, Caledonia Rhyolite, Gettysburg Rhyolite, South Mountain, or South Mountain Rhyolite. It is a blue, blue banded, or red/lavender metarhyolite. It can be mottled with black bands, streaks, or patches 1-4 cm wide. There is insignificant color change when heat-treated. When weathered some types develop a patina, others do not. It has multicolored phenocrysts of quartz and feldspar. It has a coarse to fine grained texture. Deposits include outcrops of bedrock, boulder fields often associated with outcrops or without them, streambed cobbles, and terrace deposits.
label: Notes
content: Geology remarks: Epoch- Precambrian, Form- Catoctin
label: Notes
content: Location remarks: Blue Ridge province of Maryland and Pennsylvania; Ten locations of South Mountain Metarhyolite are listed on page 7 by Stewart (1984); Cashtown Gap, Franklin Township, Adams County, PA.
label: Notes
content: Archaeology remarks: South Mountain Rhyolite was used during the Early Archaic through the late Woodland times.
label: Record Last Modified
content: 22 Nov 2019
label: Specimen Count
content: 10
place: label: Place
content: South Mountain, Adams County, Pennsylvania, 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: A599344-0
objectType: label: Object Type
content: Stone