What is "comb ceramic"

a. Of or pertaining to a hunter-gatherer culture that existed in northeastern Europe from around 4200 BC to around 2000 BC.

Comb Ceramic or Pit-Comb Ware (in Europe), Jeulmun pottery or Jeulmun vessel (in Korea) is a type of pottery subjected to geometric patterns in the comb-like tool. This type of pottery developed in northern woodland of the Eurasia, and widely distributed to Baltic, Finland, the Volga upstream flow, south Siberia, Lake Baikal, Mongolian Plateau, Liaodong Peninsula and Korean Peninsula. The oldest ones have been discovered from the remains of Liao civilization - xinglongwa culture (BC 6200 - 5400 BC) -. It appears in 4200 BC in Finland and 4000 BC in the Korean Peninsula, so the Urheimat is assumed to be Liao region and spread afterward to North Europe through Siberia and to Korean peniusla. This is possibly related to Uralic migration and spread of haprogroup N (Y-DNA).