LB - Museum Grade Mass Mortality Plate with 19 Symphysurus Ordovician Trilobites Palaeonotopterus Aragonite will change to calcite

Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C and vaterite is even less stable

The appendages show similarities to

PaleoDB taxon number: 26322

Spectacular raptor tooth of supreme quality

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LB - Museum Grade Mass Mortality Plate with 19 Symphysurus Ordovician Trilobites Palaeonotopterus Aragonite will change to calciteLB Museum Grade Mass Mortality Plate with 19 Symphysurus Ordovician TrilobitesSPECIES Symphysurus ebbestadi n. sp Trilobite. 19 individualsAGE Lower Ordovician, Upper Tremadocian stage (~480 Million Years)LOCATION North of Zagora, South MoroccoFORMATION Lower Fezouata Formation (Outer Feijas Group)SIZE (The plate) 47 cm 18. 5 inWEIGHT >4000 g REF. LBObservations: Impressive and very rare association of this lower Ordovician species. It is very