High resolution carbon isotopic analysis across the Ordovician-Silurian boundary of the Wangjiawan section, South China

The Promontory caves (Utah) and Franktown Cave (Colorado) contain high-fidelity records of short-term occupations by groups with material culture connections to the Subarctic/Northern Plains. This research uses Promontory and Franktown bison dung, hair, hide, and bone collagen to establish local baseline carbon isotopic variability and identify leather from a distant source. The ankle wrap of one Promontory Cave 1 moccasin had a δ13C value that indicates a substantial C4 component to the animal's diet, unlike the C3 diets inferred from 171 other Promontory and northern Utah bison samples. We draw on a unique combination of multitissue isotopic analysis, carbon isoscapes, ancient DNA (species and sex identification), tissue turnover rates, archaeological contexts, and bison ecology to show that the high δ13C value was not likely a result of local plant consumption, bison mobility, or trade. Instead, the bison hide was likely acquired via long-distance travel to/from an area of abundant C4 grasses far to the south or east. Expansive landscape knowledge gained through long-distance associations would have allowed Promontory caves inhabitants to make well-informed decisions about directions and routes of movement for a territorial shift, which seems to have occurred in the late thirteenth century.

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A 23.7-year long daily growth rate record of a modern giant clam shell from South China Sea and its potential in high-resolution paleoclimate reconstruction

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2021.110682 ◽

2021 ◽

Vol 583 ◽

pp. 110682

Author(s):

Nanyu Zhao ◽

Hong Yan ◽

Yuanjian Yang ◽

Chengcheng Liu ◽

Xiaolin Ma ◽

...

Keyword(s):

Growth Rate ◽

High Resolution ◽

South China Sea ◽

South China ◽

Giant Clam ◽

Daily Growth Rate ◽

Daily Growth ◽

Paleoclimate Reconstruction ◽

Clam Shell ◽

China Sea

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On the necessity of organic solvent extraction for carbon isotopic analysis ofα-cellulose: implications for environmental reconstructions

International Journal of Environmental & Analytical Chemistry ◽

10.1080/03067310903410949 ◽

2010 ◽

Vol 90 (8) ◽

pp. 605-619 ◽

Cited By ~ 4

Author(s):

Faxiang Tao ◽

Ying Liu ◽

Ning An

Keyword(s):

Solvent Extraction ◽

Organic Solvent ◽

Isotopic Analysis ◽

Carbon Isotopic ◽

Organic Solvent Extraction

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Phylogenetic model of <i>Follicucullus</i> lineages (Albaillellaria, Radiolaria) based on high-resolution biostratigraphy of the Permian Bancheng Formation, Guangxi, South China

Journal of Micropalaeontology ◽

10.1144/jmpaleo2014-012 ◽

2014 ◽

Vol 33 (2) ◽

pp. 179-192 ◽

Cited By ~ 16

Author(s):

Lei Zhang ◽

Tsuyoshi Ito ◽

Qinglai Feng ◽

Martial Caridroit ◽

Taniel Danelian

Keyword(s):

High Resolution ◽

South China ◽

Guangxi Province ◽

Phylogenetic Model ◽

Stratigraphic Ranges ◽

Abundant Genus ◽

Radiolarian Assemblages

Abstract. High-resolution sampling was performed on four Permian sections in Guangxi Province, South China (Gujingling, Sanpaoling, Guoyuan and Yutouling sections). We report abundant and well-preserved Guadalupian–Lopingian radiolarian assemblages, with 25 species belonging to three genera of the order Albaillellaria. Among them, the most abundant genus is Follicucullus with 17 species: F. bipartitus, F. charveti, F. sp. cf. F. charveti, F. dilatatus, F. falx, F. sp. cf. F. falx, F. guangxiensis, F. hamatus, F. monacanthus, F. sp. cf. F. monacanthus, F. orthogonus, F. sp. cf. F. orthogonus, F. porrectus, F. scholasticus, F. sp. cf. F. scholasticus, F. ventricosus and F. sp. cf. F. ventricosus. On the basis of composite stratigraphic ranges, this study suggests four Interval Zones in ascending order, namely F. monacanthus, F. porrectus, F. scholasticus and F. charveti Interval Zones. We provide a phylogenetic model for Follicucullus based on their morphological affinities and stratigraphic distribution. The genus Follicucullus originated from Pseudoalbaillella fusiformis, with F. monacanthus as the forerunner species from which two contemporary species then radiated: F. dilatatus and F. porrectus. Follicucullus porrectus is a long-lasting species, it is abundant in our material and several Follicucullus lineages originated from it. In terms of evolution it is considered to be the ancestor of a number of Follicucullus species.

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