Footprints of large theropod dinosaurs in the Middle–UpperJurassic (lower Callovian–lower Tithonian) Walloon Coal Measures of southern Queensland, Australia.

2020 ◽  
pp. 1-12 ◽  
Author(s):  
Anthony Romilio ◽  
Steven W. Salisbury ◽  
Andréas Jannel
Keyword(s):  
Theropod Dinosaurs ◽  
Coal Measures ◽  
Lower Callovian

A study of rock abrasivity and tool wear in Coal Measures Rocks

2008 ◽  
Vol 74 (1) ◽  
pp. 53-66 ◽  
Author(s):  
O. Yaralı ◽  
E. Yaşar ◽  
G. Bacak ◽  
P.G. Ranjith
Keyword(s):  
Tool Wear ◽  
Rock Abrasivity ◽  
Coal Measures

scholarly journals Jaw biomechanics and the evolution of biting performance in theropod dinosaurs

2010 ◽  
Vol 277 (1698) ◽  
pp. 3327-3333 ◽  
Author(s):  
Manabu Sakamoto
Keyword(s):  
Function Space ◽  
Phylogenetic Signal ◽  
Space Distribution ◽  
Phylogenetic Structure ◽  
Unique Region ◽  
Theropod Dinosaurs ◽  
Polynomial Coefficients ◽  
Evolutionary Changes ◽  
Ancestral Function ◽  
Space Occupation

Despite the great diversity in theropod craniomandibular morphology, the presence and distribution of biting function types across Theropoda has rarely been assessed. A novel method of biomechanical profiling using mechanical advantage computed for each biting position along the entirety of the tooth row was applied to 41 extinct theropod taxa. Multivariate ordination on the polynomial coefficients of the profiles reveals the distribution of theropod biting performance in function space. In particular, coelophysoids are found to occupy a unique region of function space, while tetanurans have a wide but continuous function space distribution. Further, the underlying phylogenetic structure and evolution of biting performance were investigated using phylogenetic comparative methods. There is a strong phylogenetic signal in theropod biomechanical profiles, indicating that evolution of biting performance does not depart from Brownian motion evolution. Reconstructions of ancestral function space occupation conform to this pattern, but phylogenetically unexpected major shifts in function space occupation can be observed at the origins of some clades. However, uncertainties surround ancestor estimates in some of these internal nodes, so inferences on the nature of these evolutionary changes must be viewed with caution.

On certain Anthracomyas from the Similis-Pulchra Zone of the Coal Measures

1938 ◽  
Vol 75 (10) ◽  
pp. 459-469 ◽  
Author(s):  
A. E. Trueman
Keyword(s):  
Close Connection ◽  
Limited Distribution ◽  
Lower Horizon ◽  
Coal Measures

SUMMARY(1) Reasons are given for believing that the holotype of Anthracomya adamsi Salter (the genotype of Anthracomya) has been correctly identified.(2) It is shown that the horizon of this presumed holotype is near the middle of the Similis-Pulchra Zone, and is near if not identical with the horizon of A. hindi Wright.(3) Anthracomya adamsi at that horizon has no close connection with A. modiolaris (from which it may, however, have been derived at a lower horizon). The distinction of these two forms is discussed, and it is suggested that among well preserved specimens only very occasional variants cause any difficulty in identification. The shells referred to A. adamsi. s. lat. by Weir and Leitch from the base of the Similis-Pulchra Zone (1936) are not considered in this paper.(4) The relations of A. adamsi, A. hindi and A. warei are briefly discussed: in view of the limited distribution of the various species it is thought best for the present to retain the three specific names.

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