貝塚

1. Origins, structure, and basic meaning

• Structure: 貝塚 is read かいづか and is a noun for an archaeological mound formed from discarded shells and related remains.
• Basic usage: It is used when describing the discovery of an ancient site or pottery excavated from it.

2. Common pitfalls and similar expressions

• Archaeological meaning
  • Its central meaning is an archaeological site showing traces of past life, not merely a modern accidental pile of shells.