Abstract
The study of rich rhynchonellid assemblage, collected by layers in the Early Cretaceous deposits of Dagestan, revealed sharp morphological changes of the assemblages at the Barremian-Aptian boundary; the shell exterior and almost all endoskeletal structures changed. The study of morphogenesis of the Late Mesozoic rhynchonellids revealed that boundary in the development of main shell structures during Middle Jurassic-Maastrichtian interval is also in the middle of Early Cretaceous.
Full Text 
Sign-in/Register to access full text options
Sign-in/Register to access full text options 
Published version (
Free)
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
