Cape Cod arrowhead

[maxery]

A little over a year ago I was skipping rocks on a beach in the Cape when I picked this up. It laid right at the shore line and looked to be the perfect skipping rock but after getting a closer look I went over to show my uncle to see if he knew what it could be. When I got back to the cottage I was staying I did some research and found out that this is most likely a levanna and the mineral is Marblehead Rhyolite. I had never found any Native American artifacts before but I’m psyched that this beauty will be my first. If anyone can tell me any other information on this find it would be greatly appreciated.

 

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[pepperj]

When I look the photo it looks like it's been worked, then when it's enlarged I have to wonder.
The second photo of he otherwise is too dark to see any clear detail.
Though it kind of looks natural.

 

[MAMucker]

The Atlantic Ocean is brutal. Sometimes it’s hard to see the workmanship. Your Large Levanna Triangle is missing an Ear and a good portion of the Tip. That’s a very nice find.
You are also correct regarding the local lithic material it is made from.
Here are a couple photos from my collection of the type and material:

 

[uniface]

Super !!

 

[MAMucker]

Additional info:
Levanna Traingles are named after the Levanna site in Cayuga County, NY (Richie 1928). They date between 1200-1000 BP. Around 1000 years ago, they became the dominant Arrow Point.
The very largest ones (like your example) are believed to have been mounted to Harpoons.
About 600 years ago they were supposedly replaced by the Madison Triangle.
Gathered info from: A New England Typology of Native American Projectile Points.