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15 Dec Trace of the day: Thalassinoides
On some seafloors of the Ligurian Sea, sediment mounds tower smaller openings. Each mound is likely to be connected with the nearby openings, forming a tunnel system that resembles the fossil burrow Thalassinoides.
Thalassinoides is a genus of fossil burrow consisting of horizontal branched tunnels with vertical shafts (see Dirk Knaust’s Atlas of Trace Fossils in Well Core). When dinosaurs roamed the Earth, Thalassinoides (and its producers) roamed the sea!