Cenomanian angiosperm leaf megafossils, Dakota Formation, Rose Creek locality, Jefferson County, southeastern Nebraska

Upchurch, Garland R.; Dilcher, David L.

doi:10.3133/b1915

Cited by 13 publications

(4 citation statements)

References 17 publications

(67 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ex Schimp. Upchurch & Dilcher (1990) suggested that the type species of the genus should be Celastrophyllum attenuatum Göpp. It was described as a leaf with an entire margin and distinctive petiole, causing the expansion of the Celastrophyllum concept to include entire and toothed leaves, an apparently logical aspect since Celastrus has extreme foliar variation (Upchurch & Dilcher 1990, Mu et al 2012, Liang et al 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Upchurch & Dilcher (1990) suggested that the type species of the genus should be Celastrophyllum attenuatum Göpp. It was described as a leaf with an entire margin and distinctive petiole, causing the expansion of the Celastrophyllum concept to include entire and toothed leaves, an apparently logical aspect since Celastrus has extreme foliar variation (Upchurch & Dilcher 1990, Mu et al 2012, Liang et al 2016). These include for example, the shape of the lamina ranging from elliptical to oblong or broadly ovate to orbicular; apex acute to obtuse or round and base rounded to acute (Bacon et al 2016); however, morphologies overlap at intra and interspecific levels (Mu et al 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, brochidodromous secondary veins as well as percurrent tertiary veins are common in the group (Hickey & Wolfe 1975). Subsequently, Upchurch & Dilcher (1990) indicated that all these characters are enough evidence to establish the identification of fossil leaves to Celastrus. More recently, Liang et al (2016) indicated that the secondary venation of Celastrus varies from camptodromous to craspedodromus and semicraspedodromus types.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, Liang et al (2016) indicated that the secondary venation of Celastrus varies from camptodromous to craspedodromus and semicraspedodromus types. Fossil leaves of the middle Eocene from the Green River Flora, USA, described by Hollick (1936) and reexamined by Wolfe (1977) are considered reliable records of Celastrus (Upchurch & Dilcher 1990).…”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Fossil record of Celastraceae: evaluation and potential use in molecular calibrations

2021

View full text Add to dashboard Cite

Background: Celastraceae is a morphologically heterogeneous family. For this reason, the inclusion of some taxa within this group is controversial. Recently this problem has become significant since its fossil record is recognized as an important source of information for evolutionary studies, especially those using molecular clocks which require a robust, reliable fossil record. Questions: What are the most reliable fossil records of Celastraceae? What morphological characters are used to assign fossils in the family? Study site and dates: Compilation of records contained in paleontological databases, and paleobotanical literature, covering publications from 1869 to 2018. Methods: Published information on the Celastraceae fossil record was compiled and analyzed using the most recent classification system and specialized literature on the family. Results: A total of 168 fossil records were examined, of which nine are proposed for use as molecular clock calibration points. Each specimen has a description based on a character set used for its identification, a photograph and/or illustration, their geological age is well supported, their geographic origin is known, and the specimens are in accredited home institutions with publicly accessible collections. Conclusions: The identification and establishment of relationships between fossil and extant taxa have important limitations that depend on the critical interpretation of morphology in a phylogenetic context. Therefore, it is essential to incorporate only those morphological studies in Celastraceae that help clarify its fossil record.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Fossil record of Celastraceae: evaluation and potential use in molecular calibrations

2021

View full text Add to dashboard Cite

show abstract

Lauraceous Flowers from the Potomac Group (Mid-Cretaceous) of Eastern North America

Drinnan¹,

Crane²,

Friis³

et al. 1990

Botanical Gazette

149

View full text Add to dashboard Cite

Preliminary assessment of insect herbivory across the Cretaceous-Tertiary boundary: Major extinction and minimum rebound

Labandeira¹,

Johnson²,

Lang³

2002

The Hell Creek Formation and the Cretaceous-Tertiary Boundary in the Northern Great Plains: An Integrated Continental Record Of

View full text Add to dashboard Cite

Forty-nine insect damage types morphologically characterize plant-insect associations spanning a 136 m composite boundary interval from the uppermost Cretaceous Hell Creek Formation to the lowest Paleocene Fort Union Formation. The time duration of this interval is •2.2 m.y., 1.4 m.y. of which is latest Cretaceous. These data originate from 80 localities from the Williston Basin of southwestern North Dakota and are allocated to four assemblage zones consisting of 385 megafloral morphotypes of bryophytes, ferns, conifers, cycads, Ginkgo, monocots, and 333 dicots. All 49 foliar damage types were produced by external foliage feeding, mining, galling, and piercing and sucking insects, each of which was assigned one of the following host specificity levels: generalized, intermediate, or specialized. A distinctive pattern emerged when these damage types were plotted stratigraphically: of the 22 damage types that survive the Cretaceous-Tertiary boundary (K-T), 55% are generalized; of the 15 damage types that are extinguished immediately below the boundary, all are specialized or intermediate, as are the 12 damage types that disappear in stepped fashion somewhat before the boundary. Within this interval only two damage types are unique to the Fort Union Formation, occurring during the lowest Paleocene. These data indicate that highly and moderately specialized associations were preferentially culled at the K-T boundary, disproportionately enriching early Paleocene floras in generalized herbivores as dominant colonizers. These data are local, and the Signor-Lipps effect may partially obscure the true pattern, thus restricting extrapolation to the Western Interior of North America. Nevertheless, (1) the selective extinction of specialist herbivores at the boundary, (2) the absence of significant evidence for immigrant colonization, (3) the prolonged occurrence of species-depauperate floras during the Paleocene, and (4) the high percentage of last occurrences at and not before the boundary, despite the Signor-Lipps effect, suggest a role for end-Cretaceous abiotic perturbation and consequent biotic response in the evolution of modem plant and insect associations.

show abstract

Cenomanian angiosperm leaf megafossils, Dakota Formation, Rose Creek locality, Jefferson County, southeastern Nebraska

Cited by 13 publications

References 17 publications

Fossil record of Celastraceae: evaluation and potential use in molecular calibrations

Fossil record of Celastraceae: evaluation and potential use in molecular calibrations

Lauraceous Flowers from the Potomac Group (Mid-Cretaceous) of Eastern North America

Preliminary assessment of insect herbivory across the Cretaceous-Tertiary boundary: Major extinction and minimum rebound

Contact Info

Product

Resources

About