How To Use ammonoid In A Sentence
- In the Lower Devonian, ammonoids appeared, leaving us large limestone deposits from their shells.
- Another theory is that because ammonoids grew faster and had thinner shells, the shells were not as strong as those of the nautilus.
- Strong uniformity in Permian ammonoid biostratigraphy and provincialism between Xinjiang and Pamir is suggested.
- Both Permian perrinitid ammonoid areas are located within the transitional belt between the active geosyncline and the adjacent stable platform.
- Therefore, in terms of geological age determined by radiolarians and the ammonoid, this brachiopod fauna should be assigned to the latest Changhsingian.
- Most of these are from swimming organisms, such as ammonoids and nautiloid mollusks that lived just above the deep seafloor.
- Lewy demonstrated the similarity in breeding strategies between ammonoids and extant octopods.
- This unique succession of ammonoid assemblages allows unequivocal recognition of European substage-level chronostratigraphy across the mid-Carboniferous boundary interval in North America for the first time.
- The late Viséan was therefore the time in which the major Carboniferous ammonoid provinces were separated.
- It should be noted that the inner shell wall of ammonoids was lined by an organic membrane or pellicle, a porous sheet consisting of numerous interwoven organic fibers.
