Quick question, what are these? Shallow lacustrine, early Cretaceous, Castellar Formation NE Spain – possible biogenic material? I feel like it’s too large and too irregular to be ooids or anything like that.

Quick question, what are these? Shallow lacustrine, early Cretaceous, Castellar Formation NE Spain – possible biogenic material? I feel like it’s too large and too irregular to be ooids or anything like that.