Results 41 to 50 of about 211,638 (344)

Investigating bio-events and time expansion of Calcareous nannofossils in the upper part of the Gurpi Formation and lower part of the Pabdeh Formation, northwestern Shiraz [PDF]

Journal of Stratigraphy and Sedimentology Researches, 2020
In this study, calcareous nannofossils are investigated in the upper part of the Gurpi Formation and lower part of the Pabdeh Formation at the Par-e Nobar section located in the northwest of Shiraz. The thickness of the studied section is about 41 m. The
Saeedeh Senemari, Behzad Saeedi razavi
doaj   +1 more source

A taxonomic and phylogenetic review of the anhanguerid pterosaur group Coloborhynchinae and the new clade Tropeognathinae [PDF]

Acta Palaeontologica Polonica, 2020
Anhanguerids are a particular group of pterodactyloid pterosaurs, characterized mainly by their rostral sagittal crests, well laterally expanded jaw tips and enlarged anterior teeth.
Borja Holgado, Rodrigo V. Pêgas
doaj   +1 more source

Letter. Late cretaceous seasonal ocean variability from the arctic

, 2009
The modern Arctic Ocean is regarded as barometer of global change and amplifier of global warming1 and therefore records of past Arctic change are of a premium for palaeoclimate reconstruction.
Kemp, Alan E.S., Kemp, Alan E. S., Davies, Andrew, Jennifer Pike, Pike, Jennifer, Alan E. S. Kemp, Andrew Davies   +6 more
core   +1 more source

Microborings in mid Cretaceous fish teeth

, 1999
Fish teeth and other remains from the British Cretaceous contain abundant evidence for post-mortem colonization by endolithic organisms. The borings are here recognised as occurring in three morphotypes, including a flask-shaped form not previously ...
Veltkamp, K.J., Underwood, Charlie J., Mitchell, S.F.   +2 more
core   +1 more source

A new dromaeosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Wulansuhai Formation of Inner Mongolia, China

, 2010
We describe a new dromaeosaurid theropod from the Upper Cretaceous Wulansuhai Formation of Bayan Mandahu, Inner Mongolia. The new taxon, Linheraptor exquisitus gen. et sp.
Tan, Q., Sullivan, C., Xu, X., Sullivan, Corwin, Norell, Mark A., Tan, Lin, Clark, JM, Xiao, D., Choiniere, Jonah N., Pittman, M.D., Tan, L, Pittman, Michael, Tan, Qingwei, Choiniere, J.N., Sullivan, C, Tan, Q, Hone, D.W.E., Hone, David W. E., Tan, L., Hone, DWE, Norell, MA, Li, Z., Li, Zhiquan, Xu, X, Xiao, D, Pittman, M, Clark, J.M., Choiniere, JN, Li, Z, Clark, James M., Xu, Xing, Xiao, Dong, Norrell, M.A.   +32 more
core   +1 more source

Late Cretaceous Gravitational Collapse of the Southern Sierra Nevada Batholith and Adjacent Areas Above Underplated Schists, Southern California [PDF]

, 2012
The greater Sierra Nevada batholith (SNB) is an ~ 600 km long NNW-trending composite arc assemblage consisting of a myriad of plutons exhibiting a distinct transverse zonation in structural, petrologic, geochronologic, and isotopic patterns.
Chapman, Alan Daniel
core   +1 more source

Termite colonies from mid-Cretaceous Myanmar demonstrate their early eusocial lifestyle in damp wood

National Science Review, 2019
Insect eusociality is characterized by cooperative brood care, reproductive division of labour and multiple generations of adults within a colony. The morphological specializations of the different termite castes from Burmese amber were recently reported,
Zhipeng Zhao, Xiangchu Yin, Chungkun Shih, T. Gao, D. Ren   +4 more
semanticscholar   +1 more source

Dinosaur footprints and other Ichnofauna from the Cretaceous Kem Kem Beds of Morocco

, 2014
We describe an extensive ichnofossil assemblage from the likely Cenomanian-age 'lower' and 'upper' units of the 'Kem Kem beds' in southeastern Morocco.
Baidder, Lahssen, Zouhri, Samir, David M Martill, Jeffery A Wilson, Ibrahim, Nizar, Lahssen Baidder, Paul C. Sereno (36583), David J. Varricchio (132149), Dutheil, Didier B., David J Varricchio, Varricchio, David J., Martill, David M., Wilson, Jeff A., Paul C Sereno, Sereno, Paul C., Nizar Ibrahim, Didier B Dutheil, Jeff A. Wilson (531956), Didier B. Dutheil (53097), Samir Zouhri (364453), Samir Zouhri, Lahssen Baidder (364452), Nizar Ibrahim (364450), David M. Martill (364451)   +23 more
core   +1 more source

Two Routes to Land: Genomic Underpinnings of Parallel Aerial Egg Deposition in Aquatic Old‐World Pila and New‐World Pomacea (Ampullariidae)

Advanced Science, EarlyView.
Comparative genomics of Gondwana‐diverged Pila and Pomacea reveals parallel evolution of aerial oviposition. Convergent chromosomal rearrangements reshape regulatory landscapes within topologically associating domains. Lineage‐specific gene family expansions and viral‐derived perivitelline proteins (PV1) underpin desiccation resistance.
Yufei Zhou, Huawei Mu, Xueying Nie, Yue Gao, Hui Wang, Ling Fang, Tiangang Luan, Monthon Ganmanee, Jian‐Wen Qiu, Jin Sun, Jack Chi‐Ho Ip   +10 more
wiley   +1 more source

Dercetid fishes from the Maastrichtian type area (Upper Cretaceous) of Belgium and the Netherlands

Acta Palaeontologica Polonica
The family Dercetidae comprises a diverse array of marine aulopiform actinopterygians. Until now, merely seven specimens, assigned to five species, were recorded from the Maastrichtian type area.
Jelle J.A. Heere, Jonathan J.W. Wallaard, Maarten De Rijke, John W.M. Jagt   +3 more
doaj   +1 more source