Jack's Reef Corner Notch

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The Jack's Reef Corner-Notched points (Ritchie 1971a:26)are thin and have deep notches extending obliquely from the basal corners. The blade edges commonly have an obtuse angle although some variations have straight to slightly excurvate lateral margins. It is thought that the unnotched pentagonal form were preforms for the corner-notched variety (Justice). This point is diagnostic of the latter part of the middle woodland to late woodland periods. Lithic materials used were commonly Jasper and Hornfels. The distribution of the Jack's Reef includes New England and westward and have been recovered from the Albee Mound in Indiana and are associated with the Intrusive Mound Culture in Ohio.
Pictured below are a few Jack's Reef points from coastal Connecticut.

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Here is Wm. Ritchie's description with illustrations of this very distinctive point style from his New York State typology:
http://collections.nysm.nysed.gov/pr...r_notched.html

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An example of a hornfels Jack's Reef Corner-Notch, alongside an example of a hornfels Jack's Reef Pentagonal, which can be seen as the un notched form of the corner notched type.


Left to right, 2 hornfels and 1 felsite example. All found on same RI beach.


And from the same beach, a hornfels example in-situ.
Photos by Jay Langlais.


Example 2-4 left to right are jasper and also from RI. Point far right from same beach as points posted above.

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An unusual material. Found in RI, made of oolitic chert from Pa.

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Repurposed as scrapers, one with basal damage. Jasper, coastal RI:

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Pennsylvania Jacks Reef.

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"Yellow" patinated Braintree Hornfels, Palmer River, RI. Within range for the material, somewhat larger then average.







Large Jack's Reef with rare basal notch. Braintree Hornfels.