Mid-Cretaceous heteromorph ammonite shell damage

Bite marks in Jurassic and Cretaceous ammonite s

Ammonites are among some of the best fossils to collect. They are relatively easy to find, for example, in the Lower Jurassic Posidonia Shale in Germany and the Jurassic sediments of Dorset in the south of England. The larger, wellpreserved ones will always be sought after and, if of sufficiently high quality, may even be displayed in museum exhibitions. However, while these nicely-preserved, c...

Strontium isotopes in mid-cretaceous seawater.

Model simulation of mid-cretaceous ocean circulation.

tween Eurasia and Africa that result in a primary eastward-directed, low-velocity current flow along the mid-Cretaceous Eurasian, northern Tethys margin. This conclusion appears to be at odds with sedimentologic and paleontologic field evidence (2, 3) obtained from the Helvetic tectonic unit that is exposed in the northern Alps and represents the former northern Tethys margin in southern Europe...

Hadley circulation shrinkage in the mid-Cretaceous

H. Hasegawa, R. Tada, X. Jiang, Y. Suganuma, S. Imsamut, P. Charusiri, N. Ichinnorov, and Y. Khand Department of Earth and Planetary Science, the University of Tokyo, Tokyo, Japan Chengdu Institute of Geology and Mineral Resources, Chengdu, China National Institute of Polar Research, Tokyo, Japan Department of Mineral Resources, Bureau of Geological Survey, Bangkok, Thailand Department of Geolo...

Specialized shell-breaking crab claws in Cretaceous seas.

Here we report on a large brachyuran crab species from the Late Cretaceous of Mexico that has claws indicative of highly specialized shell-breaking behaviour. This crab possessed dimorphic claws (the right larger than the left), armed with several broad teeth, including a curved tooth structure found at the base of the movable finger of the right claw. The curved tooth is similar to the one obs...