A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs

@article{Iglesias2007APL,
  title={A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs},
  author={Ari Iglesias and Peter Wilf and Kirk R. Johnson and Alba Berta Zamuner and N{\'e}stor R C{\'u}neo and Sergio D. Matheos and Brad S. Singer},
  journal={Geology},
  year={2007},
  volume={35},
  pages={947-950}
}
Few South American macrofloras of Paleocene age are known, and this limits our knowledge of diversity and composition between the end-Cretaceous event and the Eocene appearance of high floral diversity. We report new, unbiased collections of 2516 compression specimens from the Paleocene Salamanca Formation (ca. 61.7 Ma) from two localities in the Palacio de los Loros exposures in southern Chubut, Patagonia, Argentina. Our samples reveal considerably greater richness than was previously known… 

Figures from this paper

PATAGONIA’S DIVERSE BUT HOMOGENEOUS EARLY PALEOCENE FORESTS
Early Paleocene macrofloras from the Southern Hemisphere are little known, despite their significance for understanding plant evolution, biogeography, and global variation in recovery after the
Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests.
TLDR
Combined evidence indicates a biome similar to extant subtropical, or tropical montane, rainforests that persisted for at least 4.4 Myr, linking elevated floral richness to abundant rainfall.
Early Paleocene tropical forest from the Ojo Alamo Sandstone, San Juan Basin, New Mexico, USA
Abstract. Earliest Paleocene megafloras from North America are hypothesized to be low diversity and dominated by long-lived cosmopolitan species following the Cretaceous/Paleogene (K/Pg) mass
Quantitative Analysis of Cenozoic Palynofloras from Patagonia, Southern South America
The statistical analysis of published Paleocene-Late Miocene palynological data from Patagonia supports several major stages of vegetation. These stages represent distinctive floral assemblages, both
Cretaceous/Paleogene Floral Turnover in Patagonia: Drop in Diversity, Low Extinction, and a Classopollis Spike
TLDR
A palynological analysis of a section in Patagonia that shows a marked fall in diversity and abundance of nearly all plant groups across the K/Pg interval, which greatly supports previous hypotheses of high latitude southern regions as biodiversity refugia during the end-Cretaceous global crisis.
Cretaceous–Paleogene plant extinction and recovery in Patagonia
Abstract. The Cretaceous–Paleogene (K/Pg) extinction appears to have been geographically heterogeneous for some organismal groups. Southern Hemisphere K/Pg palynological records have shown lower
Paleocene high-latitude leaf flora of Antarctica Part 1: entire-margined angiosperms
Abstract Paleocene leaf floras are rare in high latitudes of the Southern Hemisphere, where studies have shown higher taxonomic diversity compared to Northern Hemisphere equivalents. The floras
Conifer woods from the Salamanca Formation (early Paleocene), Central Patagonia, Argentina: Paleoenvironmental implications
Abstract The main objective of the present work is to describe the first conifer assemblage of a mixed forest from the Danian Salamanca Formation at the Estancia Las Violetas locality (San Jorge
Late Paleocene fossils from the Cerrejón Formation, Colombia, are the earliest record of Neotropical rainforest
TLDR
Cerrejón megafossils provide strong evidence that the same Neotropical rainforest families have characterized the biome since the Paleocene, maintaining their importance through climatic phases warmer and cooler than present.
An Oligocene microthermal forest dominated by Nothofagus in Sierra Baguales, Chilean Patagonia: Response to global cooling and tectonic events
Abstract A large fossil leaf assemblage (>3700 specimens) is reported from the Oligocene Rio Leona Formation in the Sierra Baguales of Chilean Patagonia. The association comprises 29 species but is
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 32 REFERENCES
South American palaeobotany and the origins of neotropical rainforests.
  • R. Burnham, Kirk R. Johnson
  • Medicine, Biology
    Philosophical transactions of the Royal Society of London. Series B, Biological sciences
  • 2004
TLDR
It is indicated that evidence of neotropical rainforest is exceedingly rare and equivocal before the Palaeocene, and a mismatch of evidence regarding the age of origin between sites of palaeobotanical high diversity and sites of predicted tropical climates should be reconciled with intensified collecting efforts in South America.
Response of tropical vegetation to Paleogene warming
Abstract The late Paleocene-early Eocene transition was characterized by a long period of global warming that culminated with the highest temperatures of the Cenozoic. This interval is associated
Late Paleocene–early Eocene climate changes in southwestern Wyoming: Paleobotanical analysis
The warmest global temperatures of the Cenozoic Era occurred in early Eocene time, following a warming trend that started in late Paleocene time. The greater Green River Basin of southwestern Wyoming
Cenozoic Plant Diversity in the Neotropics
TLDR
A good correlation between diversity fluctuations and changes in global temperature was found, suggesting that tropical climate change may be directly driving the observed diversity pattern.
Plant and mammal diversity in the Paleocene to early Eocene of the Bighorn Basin
Abstract Abundant plant and vertebrate fossils have been recovered from fluvial sediments deposited in the Bighorn Basin, Wyoming, during the first 13 m.y. of the Tertiary. Here we outline and
Evidence for an in situ early Paleocene rainforest from Castle Rock, Colorado
A very diverse, early Paleocene (63.8 ± 0.3 Ma) fossil leaf site located in Castle Rock, Colorado represents nearly autochthonous burial of a rainforest floor. This is an unusual fossil flora
Eocene Plant Diversity at Laguna del Hunco and Río Pichileufú, Patagonia, Argentina
TLDR
Diverse floral associations in Patagonia evolved by the Eocene, possibly in response to global warming, and were persistent and areally extensive, suggesting extraordinary richness at low latitudes via the latitudinal diversity gradient.
Chronostratigraphy of the mammal-bearing Paleocene of South America
Abstract Land mammal faunas of Paleocene age in the southern Andean basin of Bolivia and NW Argentina are calibrated by regional sequence stratigraphy and magnetostratigraphy. The local fauna from
Vegetation, climatic and floral changes at the Cretaceous-Tertiary boundary
The western interior of North America has the only known non-marine sections that contain the iridium-rich clay interpreted as the Cretaceous–Tertiary (K–T) boundary1–7. Because vegetation and
Floral response to rapid warming in the earliest Eocene and implications for concurrent faunal change
Abstract During the first 10–20 Kyr of the Eocene temperatures warmed by 4–8°C in middle and high latitudes, then cooled again over the succeeding ∼200 Kyr. Major changes in the composition of marine
...
1
2
3
4
...