[dinosaur] Late Triassic vertebrate extinction + tropical peatlands before Permian-Triassic extinction + Dimetrodon conserved
Ben Creisler <[email protected]> Sun, 5 Jan 2020 16:26:12 -0800
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--000000000000979415059b6db5db Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: Quoted-printable Ben [email protected]=0A=0ASome recent papers:=0A=0A=0AReilly = F. Hayes, Gavino Puggioni, William G. Parker, Catherine S. Tiley,=0AAmanda = L. Bednarick & David E. Fastovsky (2020)=0AModeling the dynamics of a Late = Triassic vertebrate extinction: The=0AAdamanian/Revueltian faunal turnover,= Petrified Forest National Park,=0AArizona, USA.=0AGeology (advance online = publication)=0Adoi: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__= doi.org_10.1130_G47037.1&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7= CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHulQOokQ= 9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3DdE7GzOrlEi2p6LpkbLdrQYAjeVEQqIxYMZ_6bkZr1= CI&e=3D=20=0Ahttps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__pubs.ge= oscienceworld.org_gsa_geology_article-2Dabstract_doi_10.1130_G47037.1_57995= 7_Modeling-2Dthe-2Ddynamics-2Dof-2Da-2DLate-2DTriassic&d=3DDwIFaQ&c=3DclK7k= QUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4= z1CYJgFW9SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3DSCO16Vv96KW= ABZf87hCKSoJ8EaXcYqDxVQZHpOnoWg8&e=3D=20=0A=0A=0AThe coincidence of a diver= se vertebrate assemblage with a high-precision=0Ageochronology and lithostr= atigraphy in Petrified Forest National Park=0A(Arizona, USA) allows Bayesia= n quantification of the dynamics of a Late=0ATriassic vertebrate extinction= and replacement, the Adamanian/Revueltian=0A(A/R) faunal turnover. This ap= proach uniquely identifies probabilities for=0Athe tempo of the replacement= of the Adamanian assemblage by that of the=0ARevueltian, precisely trackin= g the turnover. While the method does not=0Adesignate the moment of extinct= ion, there is a negligible probability that=0Aall Adamanian extinctions, as= well as all Revueltian originations, are=0Asynchronous. A protracted A/R t= urnover is incompatible with the=0Ageologically instantaneous Manicouagan i= mpact (215.4 =C2=B1 0.20 Ma; Qu=C3=A9bec,=0ACanada) as a dominant causal me= chanism. This analytical framework=0Aconstitutes a flexible means of recons= tructing biotic turnover in a variety=0Aof deep time contexts.=0A=0A=3D=3D= =3D=3D=0A=0AFree pdf:=0A=0ADaoliang Chu, Stephen E. Grasby, Haijun Song, Ja= copo Dal Corso, Yao Wang,=0ATamsin A. Mather, Yuyang Wu, Huyue Song, Wencha= o Shu, Jinnan Tong & Paul B.=0AWignall (2020)=0AEcological disturbance in t= ropical peatlands prior to marine=0APermian-Triassic mass extinction.=0AGeo= logy (advance online publication)=0ADOI: https://urldefense.proofpoint.com/= v2/url?u=3Dhttps-3A__doi.org_10.1130_G46631.1&d=3DDwIFaQ&c=3DclK7kQUTWtAVEO= VIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9= SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3DkeERmVKYjmPGWhLJJmjK= qIPzPw2GtNax_6D0COjiHY4&e=3D=20=0Ahttps://urldefense.proofpoint.com/v2/url?= u=3Dhttps-3A__pubs.geoscienceworld.org_gsa_geology_article_doi_10.1130_G466= 31.1_579960_Ecological-2Ddisturbance-2Din-2Dtropical-2Dpeatlands-2Dprior&d= =3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGo= f_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0= dhM&s=3DMAyFVEvgaNlaaEvRsKGaex7a0eY1iMoNlb3Z-d9AauA&e=3D=20=0A=0A=0A=0AThe = Permian-Triassic mass extinction is widely attributed to the global=0Aenvir= onmental changes caused by the eruption of the Siberian Traps.=0AHowever, t= he precise temporal link between marine and terrestrial crises=0Aand volcan= ism is unclear. Here, we report anomalously high mercury (Hg)=0Aconcentrati= ons in terrestrial strata from southwestern China, synchronous=0Awith Hg an= omalies in the marine Permian-Triassic type section. The=0Aterrestrial sedi= ments also record increased abundance of fossil charcoal=0Acoincident with = the onset of a negative carbon isotope excursion and the=0Aloss of tropical= rainforest vegetation, both of which occurred immediately=0Abefore the pea= k of Hg concentrations. The organic carbon isotope data show=0Aan ~5=E2=80= =B0=E2=80=936=E2=80=B0 negative excursion in terrestrial organic matter (bu= lk organic,=0Acuticles, and charcoal), reflecting change in atmospheric CO2= =0Acarbon-isotope composition coincident with enhanced wildfire indicated b= y=0Aincreased charcoal. Hg spikes provide a correlative tool between=0Aterr= estrial and marine records along with carbon isotope trends. These data=0Ad= emonstrate that ecological deterioration occurred in tropical peatlands=0Ap= rior to the main marine mass extinction.=0A=0A=3D=3D=3D=3D=0A=0A(ICZN 2019)= Opinion 2446 (Case 3695) =E2=80=93 Dimetrodon Cope, 1878 (Synapsida,=0ASph= enacodontidae): name conserved.=0AThe Bulletin of Zoological Nomenclature 7= 6(1): 200-201=0AdoiL https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A_= _doi.org_10.21805_bzn.v76.a063&d=3DDwIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhp= N0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHu= lQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3Dqe2LHn1I5-ZopG-5Gey-j5LfYWxfcqrBO8M= mCu7iqFY&e=3D=20=0Ahttps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__b= ioone.org_journals_The-2DBulletin-2Dof-2DZoological-2DNomenclature_volume-2= D76_issue-2D1_bzn.v76.a063_Opinion-2D2446-2DCase-2D3695-2D-2DDimetrodon-2DC= ope-2D1878-2DSynapsida-2DSphenacodontidae_10.21805_bzn.v76.a063.short&d=3DD= wIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl= 9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&= s=3DDTV3kX2uqLSam5yiSK6b1C-wtH5Ss74JTf0QTIBJQIQ&e=3D=20=0A=0A=0AThe Interna= tional Commission on Zoological Nomenclature has conserved the=0Ageneric na= me Dimetrodon Cope, 1878 by giving it precedence over its senior=0Asubjecti= ve synonym Bathygnathus Leidy, 1853.=0A= --000000000000979415059b6db5db Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: Quoted-printable <div dir=3D"ltr"><div><br></div>Ben Creisler<div><a href=3D"mailto:bcreisle= [email protected]">[email protected]</a></div><div><br></div><div>Some recent p= apers:<br><div><br></div><div><br></div><div>Reilly F. Hayes, Gavino Puggio= ni, William G. Parker, Catherine S. Tiley, Amanda L. Bednarick & David = E. Fastovsky (2020)<br>Modeling the dynamics of a Late Triassic vertebrate = extinction: The Adamanian/Revueltian faunal turnover, Petrified Forest Nati= onal Park, Arizona, USA.<br>Geology (advance online publication)<br>doi: <a= href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__doi.org_10.= 1130_G47037.1&d=3DDwMFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSf= nc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHul= QOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3DdE7GzOrlEi2p6LpkbLdrQYAjeVEQqIxY= MZ_6bkZr1CI&e=3D">https://doi.org/10.1130/G47037.1</a><br><a href=3D"ht= tps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__pubs.geoscienceworld.o= rg_gsa_geology_article-2Dabstract_doi_10.1130_G47037.1_579957_Modeling-2Dth= e-2Ddynamics-2Dof-2Da-2DLate-2DTriassic&d=3DDwMFaQ&c=3DclK7kQUTWtAV= EOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1C= YJgFW9SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3DSCO16V= v96KWABZf87hCKSoJ8EaXcYqDxVQZHpOnoWg8&e=3D">https://pubs.geoscienceworl= d.org/gsa/geology/article-abstract/doi/10.1130/G47037.1/579957/Modeling-the= -dynamics-of-a-Late-Triassic</a><br><br><br>The coincidence of a diverse ve= rtebrate assemblage with a high-precision geochronology and lithostratigrap= hy in Petrified Forest National Park (Arizona, USA) allows Bayesian quantif= ication of the dynamics of a Late Triassic vertebrate extinction and replac= ement, the Adamanian/Revueltian (A/R) faunal turnover. This approach unique= ly identifies probabilities for the tempo of the replacement of the Adamani= an assemblage by that of the Revueltian, precisely tracking the turnover. W= hile the method does not designate the moment of extinction, there is a neg= ligible probability that all Adamanian extinctions, as well as all Revuelti= an originations, are synchronous. A protracted A/R turnover is incompatible= with the geologically instantaneous Manicouagan impact (215.4 =C2=B1 0.20 = Ma; Qu=C3=A9bec, Canada) as a dominant causal mechanism. This analytical fr= amework constitutes a flexible means of reconstructing biotic turnover in a= variety of deep time contexts.<br><br>=3D=3D=3D=3D<br></div><div><br></div= ><div>Free pdf:</div><div><br>Daoliang Chu, Stephen E. Grasby, Haijun Song,= Jacopo Dal Corso, Yao Wang, Tamsin A. Mather, Yuyang Wu, Huyue Song, Wench= ao Shu, Jinnan Tong & Paul B. Wignall (2020)<br>Ecological disturbance = in tropical peatlands prior to marine Permian-Triassic mass extinction. <br= >Geology (advance online publication)<br>DOI: <a href=3D"https://urldefense= .proofpoint.com/v2/url?u=3Dhttps-3A__doi.org_10.1130_G46631.1&d=3DDwMFa= Q&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGo= f_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1m= V3S0dhM&s=3DkeERmVKYjmPGWhLJJmjKqIPzPw2GtNax_6D0COjiHY4&e=3D">https= ://doi.org/10.1130/G46631.1</a><br><a href=3D"https://urldefense.proofpoint= .com/v2/url?u=3Dhttps-3A__pubs.geoscienceworld.org_gsa_geology_article_doi_= 10.1130_G46631.1_579960_Ecological-2Ddisturbance-2Din-2Dtropical-2Dpeatland= s-2Dprior&d=3DDwMFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_g= I&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHulQOok= Q9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3DMAyFVEvgaNlaaEvRsKGaex7a0eY1iMoNlb3Z= -d9AauA&e=3D">https://pubs.geoscienceworld.org/gsa/geology/article/doi/= 10.1130/G46631.1/579960/Ecological-disturbance-in-tropical-peatlands-prior<= /a></div><div><br></div><div><br></div><div><br>The Permian-Triassic mass e= xtinction is widely attributed to the global environmental changes caused b= y the eruption of the Siberian Traps. However, the precise temporal link be= tween marine and terrestrial crises and volcanism is unclear. Here, we repo= rt anomalously high mercury (Hg) concentrations in terrestrial strata from = southwestern China, synchronous with Hg anomalies in the marine Permian-Tri= assic type section. The terrestrial sediments also record increased abundan= ce of fossil charcoal coincident with the onset of a negative carbon isotop= e excursion and the loss of tropical rainforest vegetation, both of which o= ccurred immediately before the peak of Hg concentrations. The organic carbo= n isotope data show an ~5=E2=80=B0=E2=80=936=E2=80=B0 negative excursion in= terrestrial organic matter (bulk organic, cuticles, and charcoal), reflect= ing change in atmospheric CO2 carbon-isotope composition coincident with en= hanced wildfire indicated by increased charcoal. Hg spikes provide a correl= ative tool between terrestrial and marine records along with carbon isotope= trends. These data demonstrate that ecological deterioration occurred in t= ropical peatlands prior to the main marine mass extinction.</div><div><br>= =3D=3D=3D=3D<br></div><div><br></div><div>(ICZN 2019) Opinion 2446 (Case 36= 95) =E2=80=93 Dimetrodon Cope, 1878 (Synapsida, Sphenacodontidae): name con= served.<br>The Bulletin of Zoological Nomenclature 76(1): 200-201<br>doiL <= a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__doi.org_10= .21805_bzn.v76.a063&d=3DDwMFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H= 8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNo= tMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3S0dhM&s=3Dqe2LHn1I5-ZopG-5Gey-j5LfYW= xfcqrBO8MmCu7iqFY&e=3D">https://doi.org/10.21805/bzn.v76.a063</a><br><a= href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__bioone.org_= journals_The-2DBulletin-2Dof-2DZoological-2DNomenclature_volume-2D76_issue-= 2D1_bzn.v76.a063_Opinion-2D2446-2DCase-2D3695-2D-2DDimetrodon-2DCope-2D1878= -2DSynapsida-2DSphenacodontidae_10.21805_bzn.v76.a063.short&d=3DDwMFaQ&= amp;c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_= Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DjNotMuHulQOokQ9yKdH1SU19DH5yKzb6-C1mV3= S0dhM&s=3DDTV3kX2uqLSam5yiSK6b1C-wtH5Ss74JTf0QTIBJQIQ&e=3D">https:/= /bioone.org/journals/The-Bulletin-of-Zoological-Nomenclature/volume-76/issu= e-1/bzn.v76.a063/Opinion-2446-Case-3695--Dimetrodon-Cope-1878-Synapsida-Sph= enacodontidae/10.21805/bzn.v76.a063.short</a></div><div><br></div><div><br>= The International Commission on Zoological Nomenclature has conserved the g= eneric name Dimetrodon Cope, 1878 by giving it precedence over its senior s= ubjective synonym Bathygnathus Leidy, 1853.<br></div></div></div>=0A= --000000000000979415059b6db5db--