n.container for preserving historical records to be discovered at some future time

Time capsule
Time capsule
TIME CAPSULE
Time Capsule Signature
Time Capsule Signature
Time Capsule Signature
Tropical Time Capsule
Portable grave time capsule
The environment time capsule project
Space ‘time capsule’ could send a message to the future
Media Reviews: Amber: The Natural Time Capsule
A linguistic "time capsule": the Newcastle Electronic Corpus of Tyneside English
Re-encounters in China. Notes of a Journey in a Time Capsule