A new juvenile specimen of Guanlingsaurus (Ichthyosauria, Shastasauridae) from the Upper Triassic of southwestern China

A new genus and species of the cockroach family Caloblattinidae, Dazhublattella lini gen. et sp.n., is described from the Upper Triassic Xujiahe Formation of Sichuan Province, in southwestern China. The new taxon is similar to the Triassic Caloblattina mathildae (Geinitz, 1883) (Vršanský & Ansorge 2007) in the venation and pattern, but differs in the less elongated forewing with arched anterior margin. An elemental analysis of the wing is undertaken using Energy Dispersive X-ray analysis.

Download Full-text

First chirothere and possible grallatorid footprint assemblage from the Upper Triassic Baoding Formation of Sichuan Province, southwestern China

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2014.07.032 ◽

2014 ◽

Vol 412 ◽

pp. 169-176 ◽

Cited By ~ 7

Author(s):

Lida Xing ◽

Hendrik Klein ◽

Martin G. Lockley ◽

Zezhong Kan ◽

Jianping Zhang ◽

...

Keyword(s):

Sichuan Province ◽

Upper Triassic ◽

Southwestern China

Download Full-text

A seismic-based sediment provenance analysis of fluvial-deltaic members in the Upper Triassic Xujiahe Formation in the central Uplift, Sichuan Basin, Southwestern China

10.1190/segam2017-17672470.1 ◽

2017 ◽

Author(s):

Xiaoer Chen ◽

Rongcai Zheng ◽

Kun Fan ◽

Min Xu ◽

Haiyang Guo ◽

...

Keyword(s):

Sichuan Basin ◽

Upper Triassic ◽

Southwestern China ◽

Sediment Provenance ◽

Provenance Analysis ◽

Xujiahe Formation ◽

Central Uplift

Download Full-text

A juvenile Koskinonodon perfectus (Temnospondyli, Metoposauridae) from the Upper Triassic of Arizona and its implications for the taxonomy of North American metoposaurids

Journal of Paleontology ◽

10.1017/jpa.2017.18 ◽

2017 ◽

Vol 91 (5) ◽

pp. 1047-1059 ◽

Cited By ~ 2

Author(s):

Bryan M. Gee ◽

William G. Parker

Keyword(s):

North American ◽

National Park ◽

Upper Triassic ◽

Species Discrimination ◽

Rare Occurrence ◽

Chinle Formation ◽

Ontogenetic Trajectories ◽

Juvenile Specimen ◽

Diagnostic Traits ◽

Petrified Forest

AbstractMetoposaurids are temnospondyl amphibians that are well known from Upper Triassic deposits in North America, Europe, India, and Africa. Two species of metoposaurids, Koskinonodon perfectus and Apachesaurus gregorii, are among the most common fossils found in the Petrified Forest National Park (PEFO) of the southwestern United States. The two are distinguished on the basis of several cranial traits and the morphology of their intercentra, and are more informally distinguished by their overall size and biostratigraphic range. While material of adult metoposaurids is extremely common in Upper Triassic deposits, described material of juveniles is very rare, which limits the study of ontogenetic trajectories that would assist in assessing whether diagnostic traits of the smaller A. gregorii are also ontogenetically influenced traits in juveniles of K. perfectus. Here we report on material from a juvenile specimen of K. perfectus from the Petrified Forest Member (Norian) of the Chinle Formation in the PEFO. This specimen is significant because it represents the highest known occurrence of the species within the PEFO, documents a rare occurrence of a juvenile specimen of a North American metoposaurid, and records a rare North American metoposaurid specimen that includes associated cranial and postcranial material. Additionally, the combination of cranial features diagnostic of K. perfectus and intercentra of proportions intermediate between K. perfectus and A. gregorii in this specimen raises questions about the utility of several characters for species discrimination in North American metoposaurids.

Download Full-text

Triassic sponges (Sphinctozoa) from Hells Canyon, Oregon

Journal of Paleontology ◽

10.1017/s0022336000018333 ◽

1988 ◽

Vol 62 (03) ◽

pp. 419-423 ◽

Cited By ~ 6

Author(s):

Baba Senowbari-Daryan ◽

George D. Stanley

Keyword(s):

Endemic Species ◽

Upper Triassic ◽

Island Arc ◽

Tropical Island ◽

The Family ◽

Wallowa Terrane ◽

Unique Condition ◽

Hells Canyon

Two Upper Triassic sphinctozoan sponges of the family Sebargasiidae were recovered from silicified residues collected in Hells Canyon, Oregon. These sponges areAmblysiphonellacf.A. steinmanni(Haas), known from the Tethys region, andColospongia whalenin. sp., an endemic species. The latter sponge was placed in the superfamily Porata by Seilacher (1962). The presence of well-preserved cribrate plates in this sponge, in addition to pores of the chamber walls, is a unique condition never before reported in any porate sphinctozoans. Aporate counterparts known primarily from the Triassic Alps have similar cribrate plates but lack the pores in the chamber walls. The sponges from Hells Canyon are associated with abundant bivalves and corals of marked Tethyan affinities and come from a displaced terrane known as the Wallowa Terrane. It was a tropical island arc, suspected to have paleogeographic relationships with Wrangellia; however, these sponges have not yet been found in any other Cordilleran terrane.

Download Full-text

Reconstruction of maximum temperature on Zhegu Mountain, western Sichuan Plateau (China)

Climate Research ◽

10.3354/cr01606 ◽

2020 ◽

Vol 81 ◽

pp. 1-14

Author(s):

M Keyimu ◽

Z Li ◽

Y Zhao ◽

Y Dong ◽

B Fu ◽

...

Keyword(s):

Tree Growth ◽

Ring Width ◽

Volcanic Eruptions ◽

Southwestern China ◽

Maximum Temperature ◽

Driving Mechanism ◽

Western Sichuan ◽

Relationship Analysis ◽

Decadal Scale ◽

Thermal Variability

Historical temperature reconstructions at high altitudes are still insufficient in southwestern China, which is considered one of the most sensitive areas to climate change in the world. Here we developed a tree ring-width chronology of Faxon fir Abies fargesii var. faxoniana at the upper timber line on Zhegu Mountain, Miyaluo Scenic Area, western Sichuan, China. The climate-tree growth relationship analysis indicated temperature as the dominant regulator on radial tree growth in this region. The reconstruction of aggregated maximum temperature (TMX) of autumn and winter for the period 1856-2016 was achieved with a linear regression model that accounted for 43.6% of the actual variability in the common time series (1954-2016). The reconstruction identified 4 warm periods and 3 cold periods. Similarities of warm and cold periods with previously published reconstructions from nearby sites indicated the reliability of our reconstruction. The significant positive correlation between TMX reconstruction and the Asian-Pacific Oscillation index and the Atlantic Multi-decadal Oscillation index suggested a linkage between large-scale climate circulations and the thermal variability at a multi-decadal scale on the western Sichuan Plateau. We also found that solar activity exerted a strong influence on decadal temperature variability in this region. The cold periods were matched well with historical large volcanic eruptions. Our results strengthen the historical climatic information in southwestern China and contribute to further understanding the regional thermal variability as well as its driving mechanism.

Download Full-text