Thalassinoides burrows (decapoda dwelling structures) in lower cretaceous sections of southwestern and central Crimea

Burrows of Thalassinoides, which are attributed to the group of dwelling structures, occur in all the marine and coastal facies. The Lower Cretaceous sections of southwestern and central Crimea yielded the representative collection of Thalassinoides burrows belonging to the ichnospecies Th. suevicus (Rieth, 1932), which served as an object for this investigation. The burrows are confined to coarsegrained terrigenous, car bonate, and mixed sediments and contain assemblages of ichnofossils indicating coastal and shallowwater marine Skolithos and Cruziana ichnofacies. In the Mesozoic–Cenozoic, the producers of the Thalassinoides burrows were decapods, confirmed by finds of crayfish Hoploparia in them.