Faunal Realms in Jurassic and Cretaceous Belemnites

نویسندگان

چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

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...

متن کامل

Environmental drivers of crocodyliform extinction across the Jurassic/Cretaceous transition

Crocodyliforms have a much richer evolutionary history than represented by their extant descendants, including several independent marine and terrestrial radiations during the Mesozoic. However, heterogeneous sampling of their fossil record has obscured their macroevolutionary dynamics, and obfuscated attempts to reconcile external drivers of these patterns. Here, we present a comprehensive ana...

متن کامل

Mass mutations of insects at the Jurassic/Cretaceous boundary?

Diverse fossil insect assemblages near the Jurassic/Cretaceous transition from the Shar-Teg in Mongolia comprise frequent deformed species. These (first known) mass fossil animal deformities, expressed as fusions of veins changing the wing geometry, probably represent heritable mutations. They accumulated as a result of a changed structure of selective pressure, and are unique in showing how in...

متن کامل

The Triassic - Jurassic Faunal and Floral Transition in the Fundy Basin

iii ITINERARY We assemble and depart from the parking lot of Student Union building on the Dalhousie University campus at 7:30 am on Sunday (May 15 th), and conclude at approximately 7:30 pm at the same location that day. The drive from Halifax to the first stop is about 2 hours. SAFETY For personal and group safety we ask all participants to read and heed the following safety related procedure...

متن کامل

The Early Evolutionary History of Belemnites: New Data from Japan

Belemnites (Order Belemnitida), a very successful group of Mesozoic coleoid cephalopods, dominated the world's oceans throughout the Jurassic and Cretaceous. According to the current view, the phylogenetically earliest belemnites are known from the lowermost Jurassic (Hettangian, 201-199 Ma) of northern Europe. They are of low diversity and have small sized rostra without clear grooves. Their d...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Geological Magazine

سال: 1965

ISSN: 0016-7568,1469-5081

DOI: 10.1017/s0016756800057496