Proposals for quantifying two characteristics of tracheid pitting arrangement in gymnosperm woods

Pujana, Roberto R.; Ruiz, Daniela; Martínez, Leandro Carlos Alcides; Zhang, Yi

doi:10.22179/revmacn.18.455

Cited by 29 publications

(14 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the generic classification of the studied woods we followed the key for fossil genera proposed by Philippe & Bamford (2008). Descriptive terminology used here follows the IAWA list of microscopic features for softwood identification (Baas et al, 2004), with the addition of terms defined in Philippe and Bamford (2008), seriation and contiguity indices proposed by Pujana et al (2016). Pit counting method follows suggestions made by Philippe et al (2013).…”

Section: Specimen Preparationmentioning

confidence: 99%

Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina

Novas¹,

Agnolín²,

Rozadilla³

et al. 2019

MACN

View full text Add to dashboard Cite

The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris gen. et sp. nov., both large and small Megaraptoridae indet., and fragments of sauropod and theropod eggshells. The list of vertebrates is also composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated caudal vertebrae of Mammalia indet., and isolated teeth of a large mosasaur. Remains of fishes, anurans, turtles, and snakes are represented by fragmentary material of low taxonomical value, with the exception of remains belonging to Calyptocephalellidae. On the other hand, a remarkable diversity of terrestrial and freshwater gastropods has been documented, as well as fossil woods and palinological assemblages. The Chorrillo Formation continues south, in the Las Chinas River valley, southern Chile, where it is called Dorotea Formation. Both units share in their lower two thirds abundant materials of titanosaurs, whose remains cease to appear in the upper third, registering only elasmarians (Chorrillo Formation) and hadrosaurs (Dorotea Formation). Above both units there are levels with remains of invertebrates and marine reptiles. It is striking that the dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations are represented by large basal titanosaurs and Megaraptoridae coelurosaurs, being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae theropods totally absent. In contrast, these taxa are dominant components in sedimentary units of central and northern Patagonia (e.g., Allen, Los Alamitos, La Colonia formations). Such differences could reflect, in part, a greater antiquity (i.e., late Campanian-early Maastrichtian) for the Chorrillo fossils, or, more probably, different environmental conditions. Thus, knowledge of the biota of the southern tip of Patagonia is expanded, particularly those temporarily close to the K-Pg boundary.

show abstract

Section: Specimen Preparationmentioning

confidence: 99%

Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina

Novas¹,

Agnolín²,

Rozadilla³

et al. 2019

MACN

View full text Add to dashboard Cite

show abstract

“…For the generic classification of the woods, we followed the key proposed by Philippe and Bamford (2008). Indices for measuring and quantifying the intertracheary radial pitting arrangement (Cp and Si) are those of Pujana et al (2016). Si = 1.00 indicates that all the intertracheary pits are uniseriate, Si > 1.00 indicates that there are two-or moreseriate pits, Cp = 0% that no pits touch and Cp = 100% that all pits touch (Pujana et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

Brachyoxylon fossil woods with traumatic resin canals from the Upper Cretaceous Cerro Fortaleza Formation, southern Patagonia (Santa Cruz Province, Argentina)

Rombola

Greppi

Pujana

et al. 2022

Cretaceous Research

View full text Add to dashboard Cite

“…Subsequently, for each characteristic, its average minimum and maximum values were obtained, expressed as follows: average (minimum–maximum) unit. Regarding the measurement and quantification of the tracheid radial pitting, the contiguity index (Cp) and seriation index (Si) of 63 were followed.…”

Section: Methodsmentioning

confidence: 99%

Timing and causes of forest fire at the K–Pg boundary

Catharina

Kneller

Marques

et al. 2022

Sci Rep

View full text Add to dashboard Cite

We report K–Pg-age deposits in Baja California, Mexico, consisting of terrestrial and shallow-marine materials re-sedimented onto the continental slope, including corals, gastropods, bivalves, shocked quartz grains, an andesitic tuff with a SHRIMP U–Pb age (66.12 ± 0.65 Ma) indistinguishable from that of the K–Pg boundary, and charred tree trunks. The overlying mudstones show an iridium anomaly and fungal and fern spores spikes. We interpret these heterogeneous deposits as a direct result of the Chicxulub impact and a mega-tsunami in response to seismically-induced landsliding. The tsunami backwash carried the megaflora offshore in high-density flows, remobilizing shallow-marine fauna and sediment en route. Charring of the trees at temperatures up to > 1000 °C took place in the interval between impact and arrival of the tsunami, which on the basis of seismic velocities and historic analogues amounted to only tens of minutes at most. This constrains the timing and causes of fires and the minimum distance from the impact site over which fires may be ignited.

show abstract

Proposals for quantifying two characteristics of tracheid pitting arrangement in gymnosperm woods

Cited by 29 publications

References 8 publications

Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina

Paleontological discoveries in the Chorrillo Formation (upper Campanian-lower Maastrichtian, Upper Cretaceous), Santa Cruz Province, Patagonia, Argentina

Brachyoxylon fossil woods with traumatic resin canals from the Upper Cretaceous Cerro Fortaleza Formation, southern Patagonia (Santa Cruz Province, Argentina)

Timing and causes of forest fire at the K–Pg boundary

Contact Info

Product

Resources

About