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It appears to be the typical style for Geoscientist, which is mostly science questions (particularly geology/geography/paleontology related questions) and some more general knowledge/word play.
Word play is rare but not uncommon (eg 15a French mixture, much found in Anglesey, for example (7) MELANGE).
It does also occasionally have very simplistic seeming answers too (eg 7d Any granitic rock (9) GRANITOID) so I'm not totally ruling out LENSES/LENSED, it just seems wrong.
I hope that answers your question!