A mound of domestic waste consisting mainly of shells, common at prehistoric sites.
- ‘The day after his arrival in Yokohama (it was 1877, he was thirty-nine) he noticed from a train window some odd shell heaps that he guessed would be ancient burial mounds.’
- ‘The oyster shell heaps of Damariscotta and Newcastle date back at least 2,400 years.’
- ‘The enormous shell heap of Whaleback can be found on the east side of the Damariscotta River.’
- ‘The shell heaps of the Damariscotta River, in Maine, are remarkable for their number and extent.’
- ‘The shell heaps themselves were occupied for rather brief periods by single groups of people.’