Assertion: sponge's spicule | /r/HasProperty | dissolved
Facets:
value: during fossilization
type: TEMPORAL
value: easily
type: MANNER
Source sentences:
text: The first members of order Pharetronida from the Permian Period (about 299,000,000 to 251,000,000 years ago) had compact calcareous skeletons and spicules; because calcareous spicules are easily dissolved during fossilization, representatives of the Calcarea lack a compact skeleton and have left few traces.