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spongolith
spongolith n. 
/ˈspɑŋɡoʊˌlɪθ/ a fossil sponge.
Brit. /ˈspɒŋɡə(ʊ)lɪθ/
, /ˈspɒŋɡə(ʊ)lɪθ/U.S. /ˈspɑŋɡəˌlɪθ/
, /ˈspɑŋɡəˌlɪθ//ˈspɑŋɡoʊˌlɪθ/ΘΚΠ
the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [noun] > member of > fossil
spongolith1860
1860 M. F. Maury Physical Geogr. Sea (ed. 8) xiv. §614 (note) It would not be strange if these fifty-two forms were spongoliths.
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