Podocarpaceae woods (Coniferales) from middle Jurassic La Matilde formation, Santa Cruz province, Argentina

Gnaedinger, Silvia Cristina

doi:10.1016/j.revpalbo.2007.06.003

Cited by 24 publications

(24 citation statements)

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“…The palynoflora studies at Simojovel and Pichucalco, Chiapas, Mexico, that recorded pollen of Podocarpus together with other cloud forest species (Palacios‐Chávez & Rzedowski, 1993; Graham, 1999) suggest that some Podocarpus populations survived in southern Mexico throughout the late Oligocene and Miocene ( c. 20 Ma). In South America, Podocarpaceae wood fossils were reported from the Middle Jurassic in Argentina (Gnaedinger, 2007) and from the Pliocene in Colombia (Wijninga, 1996). These data suggest that Podocarpus was distributed in both continents well before completion of the Isthmus of Panama.…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of Podocarpus matudae (Podocarpaceae): pre‐Quaternary relicts in northern Mesoamerican cloud forests

Ornelas

Ruíz-Sánchez

Sosa³

2010

Journal of Biogeography

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Aim Cloud forests of northern Mesoamerica represent the northern and southern limit of the contact zone between species otherwise characteristic of North or South America. Several phylogeographic studies featuring temperate conifer species have improved our understanding of species responses to environmental changes. In contrast, conifer species that presumably colonized northern Mesoamerica from South America are far less studied. A phylogeographic study of Podocarpus matudae (Podocarpaceae) was conducted to identify any major evolutionary divergences or disjunctions across its range and to determine if its current distribution is associated with pre-Quaternary climatic and/or longdistance dispersal events. Location Northern Mesoamerica (Mexico and Guatemala).Methods Sixteen populations (157 individuals) of P. matudae were screened for variation at two plastid DNA markers. The intra-specific phylogenetic relationships among haplotypes were reconstructed using Bayesian inference. Population genetic analyses were undertaken to gain insight into the evolutionary history of these populations. To test whether genetic divergence among populations occurred at different time-scales plastid DNA sequence data and fossil-and coalescent-based calibrations were integrated. ResultsThe combination of plastid markers yielded 11 haplotypes. Differentiation among populations based on DNA variation (G ST ) (0.707, SE 0.0807) indicated a clear population structure in P. matudae. Differentiation for ordered alleles (N ST ) (0.811, SE 0.0732) was higher than that for G ST , indicating phylogeographical structure in P. matudae. Most of the total variation (81.3%, P < 0.0001) was explained by differences among populations. The estimated divergence time between the unique haplotypes from a Guatemalan population and the two most common haplotypes from the Sierra Madre Oriental in Mexico was between 10 and 20 Ma, and further haplotype divergence in the poorly resolved clade of the Sierra Madre Oriental occurred between 3 and 0.5 Ma.Main conclusions Divergence estimations support the hypothesis that extant Podocarpus matudae populations are pre-Quaternary relicts. This finding is consistent with fossil and pollen data that support a Miocene age for temperate floristic elements in Mesoamerican cloud forests, whereas further haplotype divergence within the Sierra Madre Oriental, Chiapas and Guatemala occurred more recently, coinciding with Pleistocene cloud forest refugia.

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Section: Introductionmentioning

confidence: 99%

Phylogeography of Podocarpus matudae (Podocarpaceae): pre‐Quaternary relicts in northern Mesoamerican cloud forests

Ornelas

Ruíz-Sánchez

Sosa³

2010

Journal of Biogeography

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“…The wood fossil described for the Meso-Cenozoic of Gondwana with axial parenchyma are: P. mazzonii Agashe (1969) and P. garciae Del Fueyo (1998). The anatomy of the Mata Amarilla Formation woods show uniseriate radial wall pits, scarce and diffuse axial parenchyma, cross-field pitting of the cupressoid type with 1-2 circular pits, usually uniseriate and rarely biseriate rays, low rays 1-15 cells in height (most commonly 2-3 cells high), smooth tangential and transverse walls of the parenchyma cells, and frequent intercellular axial spaces, indicating placement within Podocarpoxylon garciae Del Fueyo (Del Fueyo, 1998;Gnaedinger, 2007). The specimens describe here as P. garciae differs from P. mahabalei, P. speciosum, P. mahabalei, P. austroamericanum, and P. umzambense in the number of pits per cross-field.…”

Section: Comparisonmentioning

confidence: 99%

“…The abietinoid pitting with cross-field pits (mostly 1-2 per field), the presence of homocellular rays, and ray cells with smooth walls and scarce axial parenchyma in the wood anatomy allows the assignment of the fossils to genus Podocarpoxylon Gothan, 1905(Petriella, 1972; Del Fueyo, 1998; Bamford & Philippe, 2001;Gnaedinger, 2007;Philippe & Bamford, 2008). The fossils were compared with diverse Podocarpoxylon species that have axial parenchyma (see Table 1 in Gnaedinger, 2007; Table 2 in Franco & Brea, 2015). The wood fossil described for the Meso-Cenozoic of Gondwana with axial parenchyma are: P. mazzonii Fueyo (1998).…”

Section: Comparisonmentioning

confidence: 99%

“…(Petriella) M€ uller-Stoll & Schultze-Motel (1990), P. speciosum (Ramanujam)Trivedi & Srivastava (1989), P. mahabalei (Agashe) Trivedi & Srivastava (1989), P. schmidianumSahni (1931), P. paralatifolium Vozenin-Serra & Grant-Mackie (1996), P. austroamericanumGnaedinger (2007), P. trichinopoliense (Varma)Bose & Maheshwari (1974), P. umzambense Schultze-Motel (1966), P. stokesii Thayn & Tidwell (in Bamford & Corbett, 1995) P. mahabalei…”

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Fossil forests in the Austral Basin (Argentina) marking a Cenomanian heterogeneous forced regressive surface

et al. 2015

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The mid-Cretaceous greenhouse period in the southern Patagonia Argentina (Austral Basin) is represented by the Mata Amarilla Formation. It is composed of three informal sections which were deposited in littoral and continental environments. The boundary between the lower and middle sections of the Mata Amarilla Formation shows a drastic reduction in accommodation/sediment supply (A/S) ratio, interpreted as a forced regressive surface. This surface is characterized by a well-developed palaeosol, associated with the extensive preservation of a podocarp-dominated fossil forest over a vast area (more than 5400 km(2) ). Sedimentological and palaeopedological analyses, in conjunction with forest structure, tree density and growth ring analyses, indicate that the mid-Cenomanian forced regression can be distinguished as a non-uniform surface developed over a short period of time. This sequence boundary is recognized through a heterogeneous regional surface, delimited in the western part of the study area by an erosional surface generated by a large lateral channel migration recorded by sheet-like channel deposits with transported logs. By comparison, towards the eastern part of the study area, it appears as a paraconformity bounded by a very mature vertic Alfisol, which may have taken 40-100 ky to develop, and the preservation of a fossil forest in life position with a minimum age of 337 years. It is concluded that the extensive presence of these fossil forests at the same stratigraphic level in a vast region respond to changes in A/S ratio in a forced regressive surface at basin scale.

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“…the outcrops of the La Matilde Formation at the Gran Bajo de San Julián area contain a rich and diverse petrified plant assemblage that includes stems of Millerocaulis and Osmundacaulis of the Osmundales (herbst 2001, 2003) and trunks of Ginkgomyeloxylon of the Ginkgoales (Gnaedinger 2012) and of several conifers. Within this last group, the Podocarpaceae is well-represented by Podocarpoxylon, Circoporoxylon and Circoporopitys (Gnaedinger 2007a), whereas the Araucariaceae are represented by several species of Agathoxylon (Kloster and Gnaedinger 2018), the Cupressaceae by Protelicoxylon and Herbstiloxylon (Gnaedinger 2007b), and the taxaceae by Prototaxoxylon (Gnaedinger and herbst 2006).…”

Section: Introductionmentioning

confidence: 99%

Permineralized conifer-like leaves from the Jurassic of Patagonia (Argentina) and its paleoenvironmental implications

Fueyo

Gnaedinger

Diaz

et al. 2019

An. Acad. Bras. Ciênc.

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Anatomically preserved conifer-like leaves from the Middle Jurassic La Matilde Formation at the Barda Blanca locality in the Gran Bajo de San Julián area, southern Patagonia are described here. Leaves are assigned to conifers based on the following foliar features: thick-walled epidermal cells, a sclerenchymatic hypodermis, resin canals and transfusion tracheids associated with the vascular bundle. General mesophyll anatomy and inferred foliar morphology suggest a similarity to large, broad, linearlanceolate, multi-veined conifer-like leaves. The general foliar habit indicates an affinity with the large, multi-veined leaves of the Araucariaceae; especially with those exhibited by the species of the Araucaria sections, Araucaria and Bunya. Anatomically, the permineralized leaves exhibit xeromorphic foliar features, including thick-walled epidermal cells, an isobilateral mesophyll with well-developed palisade cells and mechanical tissue. the general leaf anatomy shown by the Patagonian specimens along with sedimentological data may suggest that during the deposition of the La Matilde Formation at the Barda Blanca locality, the parent plant was well adapted to the environmental conditions, which probably consisted of a high light intensity with an adequate quantity of water in the soil, which increased the maximum leaf conductance of CO 2 .

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Podocarpaceae woods (Coniferales) from middle Jurassic La Matilde formation, Santa Cruz province, Argentina

Cited by 24 publications

References 17 publications

Phylogeography of Podocarpus matudae (Podocarpaceae): pre‐Quaternary relicts in northern Mesoamerican cloud forests

Phylogeography of Podocarpus matudae (Podocarpaceae): pre‐Quaternary relicts in northern Mesoamerican cloud forests

Fossil forests in the Austral Basin (Argentina) marking a Cenomanian heterogeneous forced regressive surface

Permineralized conifer-like leaves from the Jurassic of Patagonia (Argentina) and its paleoenvironmental implications

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