Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Rock Drawings in Valcamonica' has mentioned 'Glacier' in the following places:
Occurrence Sentence Text Source
The vast majority of the petroglyphs are made on subglacially streamlined bedrock and glacial erratic surfaces revealed as the last glacier to form the valley retreated approximately 15,000 years ago.
The earliest rock carvings date back to epipaleolithic (or Mesolithic, Proto-Camunian,[5] 8th-6th millennium BC), several millennia after the retreat of the glacier that covered the Val Camonica (Wxc3xbcrm glaciation).