Geochronology of the Upper Alturas Formation, northern California: Implications for the Hemphillian-Blancan North American Land Mammal Age boundary

May, Steven R.; Sarna-Wojcicki, Andrei M.; Lindsay, Everett H.; Woodburne, Michael O.; Opdyke, Neil D.; Wan, Elmira; Wahl, David B.; Olson, Holly A.

doi:10.26879/493

Cited by 3 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…B, Miocene units correlated to generalized oxygen isotope curve of Raffi et al (2006); DN zones based on recalibration of de Verteuil and Norris (1996) using Dybkjaer and Piasecki (2008); MMCO = Middle Miocene Climatic Optimum. C, Pliocene and Pleistocene units correlated to generalized oxygen isotope curves of Lisiecki and Raymo (2005) and Raffi et al (2006); nannoplankton and foraminiferal boundaries follow Lourens et al (2004), Mudelsee and Raymo (2005), Raffi et al (2006), Anthonissen (2008), and Wade et al (2011); Reunion I and II subchrons follow Kidane et al (2007); Pliocene-Pleistocene boundary follows Gibbard et al (2009); Blancan-Irvingtonian Boundary follows Morgan (2005); Hemphillian-Blancan boundary follows May et al (2014); Bridgerian-Uintan boundary follows Murphey et al (2018); IRD = Ice Rafted Debris; LMGI = Late Miocene Glacial Interval; MPWP (Middle Pliocene Warm Period) from Dowsett et al (2005) and Robinson et al (2008)…”

Section: Anatomical Abbreviationsmentioning

confidence: 90%

“…AP and TR refer to antero-posterior (length) and transverse (width) measurements, respectively; P or M, upper premolars and molars, respectively; p or m, lower premolars and molars, respectively. 2008), Sanders et al (2009), Tsukui and Clyde (2012), May et al (2014), andMurphey et al (2018).A, Paleogene stratigraphic units; chronostratigraphic placement of formations based on Nystrom et al (1991), Fallaw and Price (1995), Edwards et al (2000), and Weems et al (2016); boundaries of chrons C21-C23 from Tsukui and Clyde (2012); inclusion of "Jamestown beds" in Chicora Member of Williamsburg Formation from Cicimurri et al (2016). B, Miocene stratigraphic units; DN zones based on recalibration of de Verteuil and Norris (1996) using Dybkjaer and Piasecki (2008); boundaries of chrons C4Ar-C5r from Evans et al (2007); placement of Upland unit in upper Serravallian follows Nystrom et al (1991), Huddlestun (1988), and Weems and Edwards (2007a).…”

Section: Anatomical Abbreviationsmentioning

confidence: 99%

“…B, Miocene stratigraphic units; DN zones based on recalibration of de Verteuil and Norris (1996) using Dybkjaer and Piasecki (2008); boundaries of chrons C4Ar-C5r from Evans et al (2007); placement of Upland unit in upper Serravallian follows Nystrom et al (1991), Huddlestun (1988), and Weems and Edwards (2007a). C, Pliocene and Pleistocene stratigraphic units; Pliocene/Pleistocene boundary follows Gibbard et al (2010); Reunion I and II subchrons follow Kidane et al (2007); Blancan-Irvingtonian boundary follows Morgan (2005); Hemphillian-Blancan boundary follows May et al (2014); short dashed lines in PLEISTOCENE column separate Lower, Middle, and Upper Pleistocene; see text for further discussion. RLB = Rancholabrean NALMA.…”

Section: Anatomical Abbreviationsmentioning

confidence: 99%

See 2 more Smart Citations

Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A., and additions to the fauna

Albright,

Sanders,

Weems

et al. 2019

FLMNH

View full text Add to dashboard Cite

Study of vertebrate fossils from the South Carolina Coastal Plain played a significant role in the early history of vertebrate paleontology as a scientific discipline in North America. However, a clear understanding of the state’s vertebrate biostratigraphy has been greatly hindered by the paucity of well-exposed fossil-bearing stratigraphic sections and a complicated subsurface stratigraphy. Most units, particularly those of Neogene and Quaternary age, exist as thin veneers of marine or estuarine sediments that typically occur as infilled topographic lows or erosional remnants as determined primarily from borehole stratigraphy. Hence, lateral continuity can be difficult to confirm over broad geographic areas often resulting inconfusion insofar as vertebrate fossil provenance is concerned. The evaluation of vertebrate fossils from the South Carolina Coastal Plain presented here, and of the geologic units from which they originated, or are thought to have originated, results in the first modern biostratigraphic framework for the known Cenozoic record of the state. Results provide (1) updated correlations of many units to the most recent, astronomically-tuned marine oxygen isotope stages; (2) the first viverravid from the Atlantic Coastal Plain, Didymictis proteus; (3) new information on the timing of certain Neotropical immigrants into the Southeast during the Great American Biotic Interchange, including the oldest record of Erethizon in this region and the oldest records of capybara in the USA; (4) the possible oldest record of the microtine rodent Allophaiomys pliocaenicus in the USA; (5) new details on the unit of origin for the type specimen of the archaeocete Dorudon serratus; and (6) new details on the ontogeny of the early odontocete Agorophius pygmaeus. New taxonomic records from South Carolina include Glyptotherium texanum, Holmesina floridanus, Ondatra idahoensis, Erethizon ?bathygnathum, Leopardus amnicola, Miracinonyx ?trumani, Canis lepophagus, Canis latrans, Phocanella pumila, Callophoca obscura, Monatherium sp., Anchippus texanus, Subhyracodon mitis, Aphelops ?malacorhinus, Teleoceras ?guymonense, and Perchoerus sp. New specimens of previously recorded taxa are also noted.

show abstract

Section: Anatomical Abbreviationsmentioning

confidence: 90%

Section: Anatomical Abbreviationsmentioning

confidence: 99%

Section: Anatomical Abbreviationsmentioning

confidence: 99%

See 1 more Smart Citation

Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A., and additions to the fauna

Albright,

Sanders,

Weems

et al. 2019

FLMNH

View full text Add to dashboard Cite

show abstract

“…The Hemphillian North American Land Mammal Age (NALMA; Miocene, 9-4.9 Ma; Bell et al, 2004;Tedford et al, 2004;May et al, 2014) spans an interval of profound ecological change, encompassing climatic cooling, the continued spread of grasslands, and the migration of new taxa from Eurasia and South America (Woodburne, 2004). The McKay Reservoir locality near Pendleton, Oregon (Fig.…”

Section: Introductionmentioning

confidence: 99%

New occurrences of mammals from McKay Reservoir (Hemphillian, Oregon)

Orcutt,

Schmer,

Lubisich

et al. 2024

J. Paleontol.

View full text Add to dashboard Cite

Encompassing global cooling, the spread of grasslands, and biogeographic interchanges, the Hemphillian North American Land Mammal Age is an important interval for understanding the factors driving ecological and evolutionary change through time. McKay Reservoir near Pendleton, Oregon is a natural laboratory for analyses of these factors. It is remarkable for its small vertebrate fauna including rodents, bats, turtles, and lagomorphs, but also for its larger mammal fossils like camelids, rhinocerotids, canids, and felids. Despite the importance of the site, few revisions to its faunal list have been published since its original description. We expand on this description by identifying taxa not previously known from McKay Reservoir based on specimens collected during fieldwork and through reidentification of previously collected fossils. Newly identified taxa include the borophagine canid Borophagus secundus (Matthew and Cook, 1909), the camelids Megatylopus Matthew and Cook, 1909 and Pleiolama Webb and Meachen, 2004, a dromomerycid, and the equids Cormohipparion Skinner and MacFadden, 1977 and Pseudhipparion Ameghino, 1904. Specimens previously assigned to Neohipparion Gidley, 1903 and Hipparion de Christol, 1832 lack the features necessary to diagnose these genera, which are therefore removed from the site's faunal list. The presence of Borophagus secundus, Cormohipparion, and Pseudhipparion is especially important, because each occurrence represents a major geographic range extension. This refined understanding of the fauna lays the foundation for future studies of taphonomy, taxonomy, functional morphology, and paleoecology—potentially at the population, community, or ecosystem levels—at this paleobiologically significant Miocene locality.

show abstract

“…1000 m (Woodman et al 2012). Despite a fossil record that implies a northern origin for Cryptotis (e.g., Hibbard 1953, 1957; May et al 2011), the highest regional species diversity is reached in southern Mexico and northern Central America. Syntopy of species appears to be limited, however, and the highest number that has been documented at a single locality is three (Woodman et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Two New Species of Small-Eared Shrews of the Genus Cryptotis Pomel, 1848, from the Colombian Andes (Mammalia: Eulipotyphla: Soricidae)

Woodman

2023

Annals of Carnegie Museum

View full text Add to dashboard Cite

Geochronology of the Upper Alturas Formation, northern California: Implications for the Hemphillian-Blancan North American Land Mammal Age boundary

Abstract: ABSTRACT

Cited by 3 publications

References 18 publications

Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A., and additions to the fauna

Cenozoic vertebrate biostratigraphy of South Carolina, U.S.A., and additions to the fauna

New occurrences of mammals from McKay Reservoir (Hemphillian, Oregon)

Two New Species of Small-Eared Shrews of the Genus Cryptotis Pomel, 1848, from the Colombian Andes (Mammalia: Eulipotyphla: Soricidae)

Contact Info

Product

Resources

About