FACIES CHARACTERISTICS AND TIERING DISTRIBUTIONS OF CHONDRITES

Basic characteristics and prevailing genetic models of Chondrites have been introduced and commented. Unusual features of Chondrites from the Lower Middle Ordovician transition have been reported in the west central Utah, USA. They include that tiny Chondrites were cut by other trace fossils associated with them and formed in softground,and that Chondrites were the earliest or shal lowest tiering in the complex ichnofabrics. In existing ichnofacies model trace making courses with ulti stages and ulti tiering are not stressed. Existing ichno tiering models are based mainly on the Mesozoic Cenozoic data. The reported data show that tiering distributions of Chondrites are different in Palaeozoic and Mesozoic Cenozoic. It seems that Palaeozoic tiny Chondrites can be formed in shallowest and middle tierings.

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Clc Number:

Q911