The caves themselves are of unknown age but date back in part over 380,000 years.

The mountain is made from ultramafic rock of unknown age.

About half of those are school-owned and of unknown age.

The remains are those of an adult, tentatively identified as female and of unknown age.

Of unknown age, the character debuted on February 25, 1993.

The body, which was intact inside the bag, is that of a white adult of unknown age, according to the police.

He is a generally well-mannered young boy of unknown age.

He shaded his eyes against the glare and peered down at the land upon which no man had walked for unknown ages.

There exist stone engravings from the village, of unknown age.

He entered the Liao army at an unknown age and was eventually assigned to the central province as a general.