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This formation is usually considered Late Jurassic,
but Tom Holtz (http://www.cmnh.org/dinoarch/1997Apr/msg00098.html)
said that new conchostracan work supports a Middle Jurassic age for the whole
"Mamenchisaurus fauna". Is this accepted, has there been more work on
this, and if it is true, where are the Late Jurassic Chinese
dinosaurs?
Mickey Mortimer
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