Although ammonites have been extinct for 65 million years, newly published data based on 35 years of field work and analysis is providing invaluable insights into their paleobiology.
Ammonites, shelled mollusks closely related to modern day nautilus and squids, inhabited the oceans for nearly 350 million years. Specimens found in the rock record of the ancient seaway that covered North America during the Cretaceous Period demonstrate that these animals thrived at cold methane seeps at the bottom of the sea, consumed small prey, and often survived predation attempts.
"Our field work has resulted in the discovery of exceptionally well preserved ammonites at ancient methane seeps, which permit new insights into the mode of life and habitat of these organisms," says Neil Landman, curator in the Division of Paleontology at the American Museum of Natural History. "The picture that emerges is that these ammonites had little in common ecologically with either modern nautilus or most modern coleoids. This forces us to reexamine our thinking about the ecology of ancient marine systems and how the extinction of ammonites ultimately impacted the modern marine biota."
About 70 million years ago, dinosaurs roamed the continents, the Atlantic Ocean was much narrower than today, and what is now North America was divided in half by a broad inland sea that covered much of the continent. This epicontinental sea was, according to new discoveries, partly covered by cold methane seeps of gas bubbling up from sediments below. These seeps were like underwater oases that attracted a host of organisms—bacteria, sponges, gastropods, bivalves, sea urchins, and even sea lilies that attached to the veneer of calcite that formed on the bottom at the seep sites. Ammonites were also abundant at the seeps.
"What astonishes me is that I have walked over these fossil deposits for years without ever realizing that they were the sites of cold methane seeps," says Landman.
At one locality in South Dakota, the fossilized methane seeps are exposed on the side of a steep cliff of black rock. Landman and his team criss-crossed the cliff with bright white ropes, forming a grid-like pattern onto which the team mapped the distribution of fossils.
"The result looked like an enormous Christo installation," says Landman. "You have to imagine the underwater scene 70 million years ago: a cloud of zooplankton, with ammonites flocking to the vents, forming isolated communities surrounded by the muddy sea floor. Because the sedimentation rates in the seaway were so rapid, the ammonites and other organisms were buried quickly after death, preserving exquisite details of their morphology."
The new research, published in the Bulletin of the American Museum of Natural History, redescribes the type specimens (holotypes) of two of the most common ammonite species that lived at the time: Hoploscaphites nodosus and H. brevis. The original specimens were collected over 150 years ago from what is probably South Dakota. Hoploscaphites nodosus, previously Jeletzkytes nodosus, is reassigned to Hoploscaphites because new, large fossil collections show that the traditional separation of robust, coarsely ornamented specimens from more slender, finely ornamented specimens is arbitrary. The paper also helps reconstruct the paleogeography of the epicontinetal sea that covered North America at the time as well as other seaways that covered parts of Europe.
Landman and colleagues argue that these ammonites were probably not fast swimmers. They lacked strong muscles which would have been required for strong propulsion. In addition, their jaws could only accommodate small prey and, as a result, they were probably sluggish filter feeders. Many of the ammonites also show injuries. Some of the injuries were healed during life but others resulted in death. Landman argues that the predators were probably fish, reptiles, crustaceans, and other cephalopods.
"There were probably millions of individuals in the seaway, which gives you an idea of the importance of ammonites in the marine ecosystem," says Landman.
In addition to Landman, authors of this paper include W. James Kennedy of the Oxford Museum of Natural History, William A. Cobban of the U.S. Geological Survey, and Neal L. Larson of the Black Hills Museum of Natural History. The research was funded by Nathalie Quay, the Normal D. Newell Fund at the American Museum of Natural History, and the National Science Foundation.
Kristin Elise Phillips | EurekAlert!
NASA examines Peru's deadly rainfall
24.03.2017 | NASA/Goddard Space Flight Center
Steep rise of the Bernese Alps
24.03.2017 | Universität Bern
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy