I hunt arrowheads. Although I agree with chadwickus that it doesn't look tooled or isn't typically the type of rock used, I have seen weights, for fishing nets, that are similar. They're usually large, long and phallic shaped. These types of weights are sometimes made with inferior materials not normally associated with weapons/tools. The weights only have to be heavy and hold together underwater. They aren't subjected to same kind of forces as spearheads/arrowheads or tools. Why use your best rock for weights when most any heavy rock would do.

There are many good resources on the web for identifying such objects. Just because materials might be a bit unusual don't discount the ingenuity of early man. Hunting parties would bring whatever tools/arrowheads they could carry but also styled new ones if the need arose, sometimes out of more inferior local materials.

I would imagine where you live fishing parties might have been the norm. While hauling and preserving the nets would be essential the weights could be cast aside to help ease the load. It's possible inferior materials were sometimes preferred depending on use.

Keep looking you never know what you'll find.

I would love to explore your neck of the woods. Swamps are great places to find well preserved artifacts. A few mummies have been found in swamps and bogs.

Let the weather help you search, for you dry periods might be the best time to explore areas that might otherwise be flooded, keep revisiting the site if you can. Where I live I always find the best stuff after a good rain or after the snow melts.

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