One of the very first things you should do is visit the Robbins Museum, in Middleborough, Ma. I believe they’re open on Wed. and Saturdays. They have the most extensive display of stone artifacts from southern New England, in this region.
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And you should do that because there is a learning curve, and it takes awhile to learn what stones modified, or worked, by humans, look like. Learning to recognize when a rock has been worked or modified is one thing you must learn. As well, you will also see displays showing you the types of rocks used. In other words, the second thing you must learn are the types of rocks, the lithics, used most commonly in this region: quartz, argillite, quartzite, rhyolite, chert, jasper, etc., all the types of lithics most commonly used in this region.
For instance, above are two photos of a display at the Robbins illustrating the type of lithics, that is, tool stone, used in southern New England to make flaked stone artifacts. And 90+% of what all of us find, are small flaked stone artifacts, like points, knives, scrapers, drills, etc. As you walk a field or shoreline, you want to be able to spot the correct lithics laying there, and you will learn to recognize that that piece of rhyolite laying there, looks like it’s been flaked.
It’s all practice, really. Learn what workmanship looks like, what the correct lithics look like, build up experience, and eventually spotting artifacts will become second nature.
As far as surface hunting in southern New England. Stream hunting is great in many parts of the country, but I don’t know many collectors who have had much luck here. I would concentrate in two areas: find agricultural fields, near fresh water, and walk when plowed up, and only after heavy rains. With the farmer’s permission, and the owner, as they can be two different people.
The other area to concentrate is our salt water shorelines, especially the shores of our estuaries. Look for rocks sorted on the shore, lines of rocks about the size of an average point, and walk, walk, walk. This is why you need to learn those lithics I mentioned. You must learn to stop on a dime, recognizing flaking, or “hey, that looks like argillite”, you recognize the lithic.
Visit the Robbins! Many times! Take photos to study at home. You’ve got to expose yourself to the real deal, and you will learn to spot the same while surface hunting. Good luck.