scholarly journals Lygodium with in situ spores from the middle Miocene of Southeast China and its paleoclimatic implication

2021 ◽  
pp. 104545
Author(s):  
Zixi Wang ◽  
Gongle Shi ◽  
Bainian Sun ◽  
Chong Dong ◽  
Suxin Yin ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Southeast China ◽  
In Situ Spores

scholarly journals VRTBY ICHNORODU GASTROCHAENOLITES JAKOŽTO ŽIVOTNÍ PROSTOR MLŽŮ Z LOKALITY BORAČ-PODOLÍ (KARPATSKÁ PŘEDHLUBEŇ, ČESKÁ REPUBLIKA)

2018 ◽  
Vol 25 (1-2) ◽  
Author(s):  
Jaroslav Šamánek ◽  
Radek Mikuláš ◽  
Nela Doláková ◽  
Šářka Hladilová
Keyword(s):  
Shallow Water ◽  
Water Transport ◽  
Middle Miocene ◽  
The State ◽  
Secondary User ◽  
Hiatella Arctica ◽  
Fossil Material ◽  
The Town ◽  
Hard Substrates

In 2015 the locality Borač-Podolí was newly examined. The locality is situated 8 km NW from the town of Tišnov. A large amount of shallow-water fossils of middle Miocene (Badenian) age was collected. The state of preservation of the material enabled us bivalve borings of ichnogenus Gastrochaenolites which were bored into colonies of hermatype corals and other calcareous hard substrates. In some of these borings, bivalves were found in situ. The borings were determined as Gastrochaenolites isp., Gastrochaenolites orbicularis, Gastrochaenolites lapidicus, Gastrochaenolites dijugus and Gastrochaenolites torpedo. The in situ bivalves were determined as Gastrochaena cf. intermedia, Rocellaria cf. dubia, Hiatella arctica and Cardita calyculata. The first three species probably represent primary borers while Cardita calyculata is probably a secondary user (squatter). Based on an analysis of fossil material, we can assume that borings were created aft er the death of corals during the repeated transport of these bioclasts. It led to colonizing of the whole surface of coral bioclasts. The bioclasts were then moved to deeper water. Transport to water with clay sedimentation enabled the preservation of the bivalves in situ in borings.

A dipteridaceous fern with in situ spores from the Lower Jurassic in Hubei, China

2009 ◽  
Vol 156 (1-2) ◽  
pp. 104-115 ◽  
Author(s):  
Gaëtan Guignard ◽  
Yongdong Wang ◽  
Qing Ni ◽  
Ning Tian ◽  
Zikun Jiang
Keyword(s):  
Lower Jurassic ◽  
In Situ Spores

scholarly journals Herpetological phylogeographic analyses support a Miocene focal point of Himalayan uplift and biological diversification

2020 ◽  
Author(s):  
Wei Xu ◽  
Wen-Jie Dong ◽  
Ting-Ting Fu ◽  
Wei Gao ◽  
Chen-Qi Lu ◽  
...  
Keyword(s):  
Middle Miocene ◽  
Focal Point ◽  
Himalayan Region ◽  
The World ◽  
Early Paleocene ◽  
The Rich ◽  
Source Of Information ◽  
The Himalaya ◽  
Exact Timing

Abstract The Himalaya are among the youngest and highest mountains in the world, but the exact timing of their uplift and origins of their biodiversity are still in debate. The Himalayan region is a relatively small area but with exceptional diversity and endemism. One common hypothesis to explain the rich montane diversity is uplift-driven diversification–that orogeny creates conditions favoring rapid in situ speciation of resident lineages. We test this hypothesis in the Himalayan region using amphibians and reptiles, two environmental sensitive vertebrate groups. In addition, analysis of diversification of the herpetofauna provides an independent source of information to test competing geological hypotheses of Himalayan orogenesis. We conclude that the origins of the Himalayan herpetofauna date to the early Paleocene, but that diversification of most groups was concentrated in the Miocene. There was an increase in both rates and modes of diversification during the early to middle Miocene, together with regional interchange (dispersal) between the Himalaya and adjacent regions. Our analyses support a recently proposed stepwise geological model of Himalayan uplift beginning in the Paleocene, with a subsequent rapid increase of uplifting during the Miocene, finally give rise to the intensification of the modern South Asia Monsoon.

scholarly journals Effects of Tidal Scenarios on the Methane Emission Dynamics in the Subtropical Tidal Marshes of the Min River Estuary in Southeast China

2019 ◽  
Vol 16 (15) ◽  
pp. 2790 ◽  
Author(s):  
Jiafang Huang ◽  
Min Luo ◽  
Yuxiu Liu ◽  
Yuxue Zhang ◽  
Ji Tan
Keyword(s):  
High Tide ◽  
River Estuary ◽  
Tidal Marshes ◽  
Tidal Wetlands ◽  
Ch4 Emission ◽  
Air Exposure ◽  
Southeast China ◽  
Min River ◽  
Min River Estuary

In order to accurately estimate the effects of tidal scenarios on the CH4 emission from tidal wetlands, we examined the CH4 effluxes, dissolved CH4 concentrations, and environmental factors (including in situ pH, Eh and electrical conductivity, porewater SO42−, NO3−, and NH4+) during inundation and air-exposure periods in high- and low-tide seasons in the Min River Estuary in southeast China. By applying static and floating chambers, our results showed that the CH4 effluxes during the inundation periods were relatively constant and generally lower than those during the air-exposed periods in both seasons. When compared, the CH4 effluxes during the air-exposed periods were significantly higher in the high-tide season than those in the low-tide season. In contrast, CH4 effluxes during the inundation periods were significantly lower in the high-tide season than those in the low-tide season. During the inundation periods, dissolved CH4 concentrations were inversely proportional to in situ Eh. Under air-exposed conditions, CH4 effluxes were proportional to in situ pH in both seasons, while the dissolved CH4 concentrations were negatively correlated with the porewater SO42− concentrations in both seasons. Our results highlighted that CH4 effluxes were more dynamic between inundation and air-exposure periods compared to low- and high-tide seasons.

Redescription of two ghost shrimps (Decapoda: Axiidea: Callianassidae) from the Middle Miocene of the Central Paratethys: systematics, intraspecific variation, and in situ preservation

Zootaxa ◽  
2012 ◽  
Vol 3210 (1) ◽  
pp. 1 ◽  
Author(s):  
MATÚŠ HYŽNÝ ◽  
NATÁLIA HUDÁČKOVÁ
Keyword(s):  
Intraspecific Variation ◽  
Middle Miocene ◽  
Type Material ◽  
Central Paratethys ◽  
In Situ Preservation ◽  
Major Cheliped ◽  
Material Form

A redescription of two Middle Miocene burrowing ghost shrimps of the Central Paratethys, Callianassa brocchiiLőrenthey, 1897 and Callianassa pseudorakosensis Lőrenthey in Lőrenthey & Beurlen, 1929, is provided. Material form-ing the basis of this study comes from the Studienka Formation (lower 'Sarmatian', Serravallian) of the Slovak part of theVienna Basin and exhibits preservation allowing reassignment of the studied taxa to the genera Neocallichirus Sakai, 1988and Eucalliax Manning & Felder, 1991 respectively. The major cheliped of both species exhibits two distinct morphotypesinterpreted herein as possible sexual dimorpism. Several specimens of both taxa are preserved within the tube structuresand are interpreted as in situ preservation within the burrows. Type material of both studied taxa and additional collections from the roughly coeval strata of Hungary and Austria were also studied.

A reassessment of the Pennsylvanian lycophyte cone Triplosporite Brown

2014 ◽  
Vol 64 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Barry A. Thomas ◽  
Jiří Bek
Keyword(s):  
Junior Synonym ◽  
The Other ◽  
Type Collection ◽  
In Situ Spores

Abstract The type collection of the lycopsid cone species Triplosporite brownii Unger was re-examined to assess its in situ spores. The cones are monosporangiate with only microspores that possess both cingulum and zona. They equate to the dispersed miospore genus Lycospora and would be identified as Lycospora cf. pseudoannulata. Therefore, the genus Triplosporite Brown is shown to be a junior synonym to Lepidostrobus and a species emendation is given. A comparison is given with the other Lepidostrobus cones which yielded similar in situ microspores of the Lycospora pellucida Group.

Dimorphic fronds and in situ spores of Drynaria (Polypodiaceae) from the upper Pliocene of Southwest China

2012 ◽  
Vol 172 ◽  
pp. 1-9 ◽  
Author(s):  
Jing-Yu Wu ◽  
Bai-Nian Sun ◽  
San-Ping Xie ◽  
Su-Ting Ding ◽  
Wen-Wen Wen
Keyword(s):  
Southwest China ◽  
In Situ Spores
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