arenicolite

\\-əˌlīt\ noun (-s)

Etymology: New Latin Arenicola + English -ite

: a marking found on certain stratified rocks generally regarded as the trail of a mollusk or crustacean though formerly supposed to represent arenicolous worm borrows or trails

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arenicolite

(ærɪˈnɪkəlaɪt)

[f. mod.L. arēnicol-a sand-worm, lob-worm (f. arēna sand + -cola inhabiting) + -ite.]

A worm-hole made originally in sand, and preserved in a sandstone rock.

in Webster.