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Can anyone help me understand what this is, or what causes this kind of texture?

My first fossil encounters began here, on a little Maine beach, more than a few years ago. My grandparents lived only a hundred yards away and I lived here every summer as a child. Five generations of my family have cherished these rocks ever since. I don't live here now, at the edge of the sea, but I am still fortunate enough to visit my childhood playground often. I was here this week, wrestling with plumbing and storm windows, and enjoying the opportunity to wander on the sand, explore the tidepools and search among the tumbled cobbles for an increasingly infrequent brachiopod or two. Most of the exposed bedrock is a wonderfully swirly and deformed metamorphic tale of shifting sands, tectonic plates and molten magma. The cobbles on the beach are mostly an Ordovician, Silurian and Devonian potpourri. The dark mudstones which occasionally reveal a few worn brachiopods are probably Silurian. While fossils were fairly common when I first began looking, I now can wander an hour with not a find. I was happy, then, when I uncovered this 7-inch plate. Not too impressive in another setting, but the best I've found here in quite awhile. I was lucky to find this as well. I'll add a few more photos, now, and maybe I'll add to this thread as time goes by. Thanks for looking.

While clearing rocks out of my garden I found two - this is one. I took these pictures with my phone - I have others taken with a high-end camera, but as I see things in these pictures I don't see in those, I'm going with these to start. They're from Moosebec Reach I think, between Jonesport and Beals Island. Since there were two together, I imagine someone found them and eventually dumped them "out back". That is all I know ... anyone???????