subfossil
Geological term for remains that are not fully fossilized; often used in contrast with 半化石 (hemifossil).
See also: 半化石
Many subfossils have been found in this stratum.
index fossil; guide fossil
Compound of 準 (jun, 'quasi-') and 化石 (kaseki, 'fossil'). The prefix 準- indicates something that is nearly or partially a fossil.