Answer: timecapsule

AnswerCrossword Clue
TIMECAPSULEBuried past
TIMECAPSULEHistoric cache for future millennia
TIMECAPSULEContainer for cultural curios
TIMECAPSULEMeans of communication with the future
TIMECAPSULETrove for future historians.
TIMECAPSULEItem for historians of the future.
TIMECAPSULECornerstone contents.
TIMECAPSULEVoyager Golden Record, e.g.
TIMECAPSULEResult of watchmaker-pharmacist union?
TIMECAPSULEResult of a watchmaker-pharmacist union?
TIMECAPSULEHistoric cache