Crossword clue: an extinct genus of bryzoa characteristic of the subcarboniferous rocks. its form is that of a screw.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
archimedes
10 letters
web-def
Greek mathematician and physicist noted for his work in hydrostatics and mechanics and geometry (287-212 BC)