scholarly journals Dinosaur tracks from Tang Dynasty Grottoes area in Sichuan Province, China

2021 ◽  
Vol 2 (2) ◽  
pp. 283-292
Author(s):  
Lida Xing ◽  
Martin G. Lockley ◽  
Zheng Ren ◽  
Chang Liu ◽  
W. Scott Persons IV ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Tang Dynasty ◽  
Sichuan Basin ◽  
Plane Surface ◽  
Bedding Plane ◽  
Sichuan Province ◽  
Dinosaur Tracks

In recent years the number of track sites discovered and reported from the Lower Cretaceous Jiaguan Formation, Sichuan Basin has increased steadily. Here we report on the 20th and 21st sites which are situated in unusual locations in a cave and on a steep bedding plane surface in association with Tang Dynasty grottoes. The ichnofauna is represented by two small assemblages which are both theropod-dominated. Due to sub-optimal preservation, the tracks are identified only as grallatorid and small and larger eubrontid, with Paracorpulentapus also tentatively recognized.

scholarly journals Theropod footprints from the Lower Cretaceous Cangxi Formation in the Northern Margin of the Sichuan Basin, China

2021 ◽  
Vol 2 (1) ◽  
pp. 174-182
Author(s):  
Lida Xing ◽  
Martin G. Lockley ◽  
Bolin Tong ◽  
Hendrik Klein ◽  
W. Scott Persons IV ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Sichuan Basin ◽  
Sichuan Province ◽  
First Report ◽  
Northern Margin ◽  
Single Well ◽  
The Sichuan Basin

A single well-preserved theropod trackway identified as Eubrontes was discovered in the Lower Cretaceous (Berriasian-Valanginian) Cangxi Formation on the northern margin of the Sichuan Basin This is the first report of tracks from this formation. The occurrence is consistent with reports of theropod dominated ichnofaunas from broadly coeval deposits such as the Feitianshan Formation in southern parts of the basin. There is growing evidence that Eubrontes and Eubrontes-like tracks are common in the Lower Cretaceous of Sichuan Province.

scholarly journals The new ichnotaxon Eubrontes nobitai ichnosp. nov. and other saurischian tracks from the Lower Cretaceous of Sichuan Province and a review of Chinese Eubrontes-type tracks

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Li-Da Xing ◽  
Martin G. Lockley ◽  
Hendrik Klein ◽  
Li-Jun Zhang ◽  
Anthony Romilio ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Sichuan Province ◽  
Theropod Tracks

AbstractThe Jiaguan Formation and the underlying Feitianshan Formation (Lower Cretaceous) in Sichuan Province yield multiple saurischian (theropod–sauropod) dominated ichnofaunas. To date, a moderate diversity of six theropod ichnogenera has been reported, but none of these have been identified at the ichnospecies level. Thus, many morphotypes have common “generic” labels such as Grallator, Eubrontes, cf. Eubrontes or even “Eubrontes-Megalosauripus” morphotype. These morphotypes are generally more typical of the Jurassic, whereas other more distinctive theropod tracks (Minisauripus and Velociraptorichnus) are restricted to the Cretaceous. The new ichnospecies Eubrontes nobitai ichnosp nov. is distinguished from Jurassic morphotypes based on a very well-preserved trackway and represents the first-named Eubrontes ichnospecies from the Cretaceous of Asia.

scholarly journals A diversified dinosaur track assemblage from the Lower Cretaceous Xiaoba Formation of Sichuan Province, China: Implications for ichnological database and census studies

2019 ◽  
Vol 96 ◽  
pp. 120-134 ◽  
Author(s):  
Lida Xing ◽  
Martin G. Lockley ◽  
Kui Tong ◽  
Guangzhao Peng ◽  
Anthony Romilio ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Sichuan Province

Confidence intervals on stratigraphic ranges with nonrandom distributions of fossil horizons

Paleobiology ◽  
1997 ◽  
Vol 23 (2) ◽  
pp. 165-173 ◽  
Author(s):  
Charles R. Marshall
Keyword(s):  
Confidence Intervals ◽  
Potential Function ◽  
Water Depth ◽  
Plane Surface ◽  
Quantitative Measure ◽  
A Priori Estimate ◽  
Bedding Plane ◽  
Recovery Potential ◽  
Stratigraphic Position ◽  
Stratigraphic Ranges

A generalized method for calculating confidence intervals on the position of the true end point of a stratigraphic range when the distributions of fossil horizons is nonrandom is presented. The method requires a quantitative measure of collecting and/or preservation biases with stratigraphic position. This fossil recovery potential function may be based on (among other variables) bedding-plane surface areas, or, given a water depth curve, an a priori estimate of the preservation potential with water depth. The approach assumes that the observed distribution of fossil horizons is consistent with the distribution predicted by the fossil recovery potential function, an assumption that must be tested before the method is applied. Unlike previous methods for calculating confidence intervals on the end points of stratigraphic ranges, this method may be applied when the number of fossil horizons is correlated with stratigraphic position. The approach should only be applied to sections that have been sampled continuously, or approximately continuously. Its efficacy will depend on how accurately fossil recovery potentials can be determined. A method is also presented for estimating the probability that a species became extinct during a major hiatus in the rock record.

scholarly journals Fast-Running Theropods Tracks From the Early Cretaceous of La Rioja, Spain

2021 ◽  
Author(s):  
Pablo Navarro-Lorbés ◽  
Javier Ruiz ◽  
Ignacio Díaz-Martínez ◽  
Erik Isasmendi ◽  
Patxi Sáez-Benito ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Lower Cretaceous ◽  
Fossil Record ◽  
Biomechanical Models ◽  
Fast Running ◽  
Long Time ◽  
Dinosaur Tracks ◽  
Theropod Tracks ◽  
La Rioja

Abstract Theropod behaviour and biodynamics are intriguing questions that paleontology has been trying to resolve for a long time. The lack of extant groups with similar bipedalism has made it hard to answer some of the questions on the matter, yet theoretical biomechanical models have shed some light on the question of how fast theropods could run and what kind of movement they showed. The study of dinosaur tracks can help answer some of these questions due to the very nature of tracks as a product of the interaction of these animals with the environment. Two trackways belonging to fast-running theropods from the Lower Cretaceous Enciso Group of Igea (La Rioja) are presented here and compared with other fast-running theropod trackways published to date. The Lower Cretaceous Iberian fossil record and some features present in these footprints and trackways suggest a basal tetanuran, probably a carcharodontosaurid or spinosaurid, as a plausible trackmaker. Speed analysis shows that these trackways, with speed ranges of 6.5−10.3 and 8.8−12.4 ms-1, testify to some of the top speeds ever calculated for theropod tracks, shedding light on the question of dinosaur biodynamics and how these animals moved.

scholarly journals Lower Cretaceous Dinosaur Tracks from Puebla, Mexico

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Rubén A. Rodríguez-de la Rosa ◽  
Víctor M. Bravo-Cuevas ◽  
Enrique Carrillo-Montiel ◽  
Arturo Ortiz-Ubilla
Keyword(s):  
Lower Cretaceous ◽  
San Juan ◽  
Sedimentary Sequence ◽  
Level Ii ◽  
Sauropod Tracks ◽  
Dinosaur Tracks ◽  
Level I ◽  
Magdalena River ◽  
San Martín

Dinosaur tracks have been identified near San Martín Atexcal, southern Puebla, Mexico, within the sedimentary sequence of the San Juan Raya Formation of Lower Cretaceous (Albian) age. The tracksite, located in the bed of the Magdalena River, reveals six different ichnofossiliferous levels identified within a 9 m thick sedimentary sequence. The inferred environment is that of a tidal (marginal marine) mudflat (Level I). Level I preserves three theropods trackways (?Allosauroidea), additionally, isolated tracks belonging to iguanodontids (Ornithopoda). Level II preserves faint iguanodontid tracks. Levels III to V preserve sauropod tracks. Younger level VI preserves, although morphologically different, a track belonging to Ornithopoda. The dinosaur tracks from San Martín Atexcal support the existence of continental facies within the San Juan Raya Formation; they represent the second record of dinosaur tracks from the Lower Cretaceous of Mexico and are part of an important but little documented record of Lower Cretaceous dinosaurs in Mexico.

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