ancient pottery

Found this on the beach in Puerto Rico. The black lines have been carved out and the glaze seems to have been tempered with sand perhaps as it has some sparkles in parts of it. Fairly thick and appears to be hand made (no wheel throwing lines). If i could get an aprox date of origin or place of...

I found this on a beach in an inner harbor after the Tsunami from Japan. (It was found in an area where ancient Native villages once were). It appears to be a tablet, or a piece of a pottery that was very large. It is fossilized. Some of the glyphs look familiar, (as I have been trying to...