Now compare the above image to this one:
Here is an enlarged view and sample of this rock type:
Noticably the entire rock is composed only of shells and their fragments and as I found out back at home also tiny nodules that I think are pellets. I wonder if it would be correctly classified as a Bio(pel)sparudite (it is hard to say if it is micrite or sparite without a thin section) or Grainstain or Packstone. It's definitly a limestone though. It fizzes like crazy. I assume we are locking at a modern and ancient example of very similar if not identical depositional environments where a lot of shells are washed together with some pelletal grains. On second thought the pellets might also be later formations of micrite. They are really tiny.
A shame I do not know anything about the coastal geology of Romania but I like to think of the above foto as modern and ancient examples united right next to each other. If I should be mistaken feel free to correct me. Perhaps Zoltan or one of our sedimentologists can shed some light on this?