Chickies Formation

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Chickies Formation
Stratigraphic range: Cambrian
Chickies Rock 51ddc90ce4b0f72b447212a9.jpg
Chickies Rock (1892)
Type Metamorphic
Sub-unitsHellam Conglomerate Member
Lithology
Primary Quartzite
Other Slate, schist
Location
Region Pennsylvania, New Jersey, Maryland
CountryFlag of the United States (23px).png  United States
Extent Mid-Atlantic United States
Type section
Named for Chickies Rock
Named by J. Peter Lesley
Year defined1876

The Cambrian Chickies Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and Maryland. It is named for Chickies Rock, north of Columbia, Pennsylvania along the Susquehanna River.

Contents

Description

The Chickies Formation is described as a light-gray to white, hard, massive quartzite and quartz schist with thin interbedded dark slate at the top. Included at the base is the Hellam Conglomerate Member. It is a rare metamorphic rock that has fossils; Skolithos is found throughout the formation. [1]

Depositional age

Relative age dating places the Chickies in the Lower Cambrian Period, deposited between 542 and 520 million years ago (±2 million years). [2]

Economic geology

The Chickies is quarried as a building stone and for aggregate. The stone used to build the restrooms at Valley Forge National Historical Park is Chickies quartzite. [3]

See also

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References

  1. Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.
  2. Blackmer, G.C., (2005). Preliminary Bedrock Geologic Map of a Portion of the Wilmington 30- by 60-Minute Quadrangle, Southeastern Pennsylvania. Pennsylvania Geologic Survey, Open-File Report OFBM-05-01.0.
  3. "Pennsylvania Trail of Geology" (PDF). Archived from the original (PDF) on 2009-03-27.