Cardium pottery

Cardium pottery or Cardial ware is a Neolithic decorative style that gets its name from the imprinting of the clay with the heart-shaped shell of the Cerastoderma glaucum, a member of the cockle family Cardiidae. These forms of pottery are in turn used to define the Neolithic culture which produced and spread them, commonly called the "Cardial culture".

The alternative name, impressed ware, is given by some archaeologists to define this culture, because impressions can be made with sharp objects other than cockle shells, such as a nail or comb. Impressed pottery is much more widespread than the Cardial. Impressed ware is found in the zone "covering Italy to the Ligurian coast" as distinct from the more western Cardial extending from Provence to western Portugal. The sequence in prehistoric Europe has traditionally been supposed to start with widespread Cardial ware, and then to develop other methods of impression locally, termed "epi-Cardial". However the widespread Cardial and Impressed pattern types overlap and are now considered more likely to be contemporary.

The Mediterranean Neolithic

This pottery style gives its name to the main culture of the Mediterranean Neolithic: Cardium pottery culture or Cardial culture, or impressed ware culture, which eventually extended from the Adriatic sea to the Atlantic coasts of Portugal and south to Morocco.

The earliest impressed ware sites, dating to 6400–6200 BC, are in Epirus and Corfu. Settlements then appear in Albania and Dalmatia on the eastern Adriatic coast dating to between 6100 and 5900 BC. The earliest date in Italy comes from Coppa Nevigata on the Adriatic coast of southern Italy, perhaps as early as 6000 cal B.C. Also during Su Carroppu culture in Sardinia, already in its early stages (low strata into Su Coloru cave, c.