Experimental browser for the Atmosphere
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#SpongeThursday Coeloptychium agaricoides - a #fossil hexactinellid ("glass") sponge - Upper #Cretaceous (~75 MYA), Germany. Folded underside of discoidal sponge body w attachment point for hollow "stem" that held it above the sea floor. Flat upper surface w alternate dense & open meshwork bands.
Apr 10, 2025, 2:58 PM