کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6448394 | 1642085 | 2012 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New sedimentological, palaeobotanical, and dinosaur ichnological data on the palaeoecology of an unnamed Late Cretaceous rock unit in Wrangell-St. Elias National Park and Preserve, Alaska, USA
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
An unnamed nonmarine sedimentary package of rocks in southeastern Alaska in Wrangell-St. Elias National Park and Preserve has provided the first evidence of dinosaurs for this vast region. The rock unit is contained within the Wrangellia Terrane and exposures are of limited geographic extent. The rock unit is considered to be latest Cretaceous age. Sections are overwhelmingly dominated by extraformational conglomerates. Fine- to medium-grained light coloured sandstones are common and medium grey shales occur as minor components of the sections. Megafloral specimens indicate an abundance of horsetails, ferns and gymnosperm wood. Rather than two-dimensional impressions, most ferns are preserved in three dimensions, suggesting rapid burial. The abundance of charcoal in these rocks suggests that this area during deposition was also prone to ecological disturbance. Field parties found evidence of a small theropod and ornithopods. A single theropod pes impression is approximately 9Â cm long and 7Â cm wide. Attribution to the Theropoda was based on the sinusoidal shape of the impression of the middle digit. An ornithopod impression, identified by clearly blunt and rounded digit impressions, is approximately 22Â cm long and 26Â cm wide. All impressions are under tracks.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 37, October 2012, Pages 291-299
Journal: Cretaceous Research - Volume 37, October 2012, Pages 291-299
نویسندگان
Anthony R. Fiorillo, Thomas L. Adams, Yoshitsugu Kobayashi,