With new data acquired from yesterday's trip, we found the rocks at low tide (around 11am). The rock is mostly sandstone cemented with Fe-Mg oxides, with a few shells (upper left sample), probably from bivalves. Below the sandstone, sparse layers of unconsolidated grey clay may be found, similar to some cores. Fun fact: because of those clays' ability to become hard once they dry, some people describe its use as cement.