Occurrences of Early Cretaceous fossil woods in China: Implications for paleoclimates

Yang, Xiaoju; Wang, Yongdong; Zeng, Wu

doi:10.1016/j.palaeo.2013.05.019

Cited by 41 publications

(10 citation statements)

References 28 publications

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“…Paleobotanical studies indicate that the lakes of the Jehol biota were surrounded by predominantly coniferous forest, with only a minor contribution from deciduous plants [ 32 , 33 , 34 , 35 ]. The evidence for adjacent forests, such as petrified tree trunks in many of the lacustrine deposits yielding exceptional vertebrate fossils in the Jehol biota [ 36 ], and the dominance of evergreen canopy support our observations of adaptations for closed habitat illumination in this Psittacosaurus . It is, of course, possible that there was variation in color across the species’ range, and we would predict that this would mirror differences in the light environment.…”

Section: Discussionsupporting

confidence: 75%

3D Camouflage in an Ornithischian Dinosaur

Nicholls²,

et al. 2016

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SummaryCountershading was one of the first proposed mechanisms of camouflage [1, 2]. A dark dorsum and light ventrum counteract the gradient created by illumination from above, obliterating cues to 3D shape [3, 4, 5, 6]. Because the optimal countershading varies strongly with light environment [7, 8, 9], pigmentation patterns give clues to an animal’s habitat. Indeed, comparative evidence from ungulates [9] shows that interspecific variation in countershading matches predictions: in open habitats, where direct overhead sunshine dominates, a sharp dark-light color transition high up the body is evident; in closed habitats (e.g., under forest canopy), diffuse illumination dominates and a smoother dorsoventral gradation is found. We can apply this approach to extinct animals in which the preservation of fossil melanin allows reconstruction of coloration [10, 11, 12, 13, 14, 15]. Here we present a study of an exceptionally well-preserved specimen of Psittacosaurus sp. from the Chinese Jehol biota [16, 17]. This Psittacosaurus was countershaded [16] with a light underbelly and tail, whereas the chest was more pigmented. Other patterns resemble disruptive camouflage, whereas the chin and jugal bosses on the face appear dark. We projected the color patterns onto an anatomically accurate life-size model in order to assess their function experimentally. The patterns are compared to the predicted optimal countershading from the measured radiance patterns generated on an identical uniform gray model in direct versus diffuse illumination. These studies suggest that Psittacosaurus sp. inhabited a closed habitat such as a forest with a relatively dense canopy.Video Abstract

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Section: Discussionsupporting

confidence: 75%

3D Camouflage in an Ornithischian Dinosaur

Nicholls²,

et al. 2016

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“…The Agathoxylon santacruzense described here show distinct growth rings and they are of type A or B as classified by Creber & Chaloner (1984) and illustrated by Brison et al (2001) reflecting paleoclimate of this area did have marked seasons during the tree growth (Fritts, 1976;Creber & Chaloner, 1985;Francis & Poole, 2002;Yang et al, 2013). The other wood taxa Cupressinoxylon, Ginkgoxylon, Podocarpoxylon, Prototaxoxylon and Taxaceoxylon with distinct growth rings reported from the Kota Formation also favors such interpretations (Chinnappa & Rajanikanth, 2018).…”

Section: Stratigraphic and Palaeoecological Significancesupporting

confidence: 54%

Agathoxylon santacruzense Kloster & Gnaedinger from the Lower–Middle Jurassic Kota Formation, India and its paleoenvironmental implications

Chopparapu¹,

Kavali²

2020

Rev. bras. paleontol.

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“…The prevalently warm and humid climate in Stage II with short and seasonal intervals of cold and drought (X. J. Yang et al, 2013;Z. H. Zhou, 2014) are more likely controlled by the fluctuating global climate in the Early Cretaceous (Keller, 2008;Price & Hart, 2002).…”

Section: Effects Of Volcanic Gasesmentioning

confidence: 99%

Linking the Jehol Biota Evolution to the Early Cretaceous Volcanism During the North China Craton Destruction: Insights From F, Cl, S, and P

Wang

Liu

et al. 2022

JGR Solid Earth

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Volcanism provides an important mechanism for transferring heat and matter (including volatiles and nutrient elements) from the Earth's interior to its surface reservoirs (Mather, 2015). Studies on the linkage between large igneous provinces (LIPs) and mass extinction events have shown that the volatiles, such as F, Cl, and S, released by giant magmatic events can have strong global-scale effects on the biotic, environmental, and climatic evolution (Callegaro et al., 2014;Oppenheimer et al., 2014;Sobolev et al., 2011). However, what are the effects of less extensive continental magmatism on the evolutionary history of regional biota remain largely unconstrained. Climate-modifying volcanic gases (CO 2 , SO 2 , and halogens) may cause biota poisoning, environmental acidification, ozone depletion, and climatic warming or cooling (Ernst & Youbi, 2017). In contrast, nutrients (e.g., P, Fe)

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Occurrences of Early Cretaceous fossil woods in China: Implications for paleoclimates

Cited by 41 publications

References 28 publications

3D Camouflage in an Ornithischian Dinosaur

3D Camouflage in an Ornithischian Dinosaur

Agathoxylon santacruzense Kloster & Gnaedinger from the Lower–Middle Jurassic Kota Formation, India and its paleoenvironmental implications

Linking the Jehol Biota Evolution to the Early Cretaceous Volcanism During the North China Craton Destruction: Insights From F, Cl, S, and P

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