Chapter 11

Whistler, David P.; Lander, E. Bruce

doi:10.1206/0003-0090(2003)279<0231:c>2.0.co;2

Cited by 16 publications

(2 citation statements)

References 14 publications

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“…In Upper Paleocene strata lying above a regional unconformity (Runyon Canyon surface of Colburn and Novak, 1989) and below a tuff horizon dated at 56 Ma, unmetamorphosed quartz arenite clasts (orthoquartzites) become abundant, and remain common in virtually all conglomerates (Colburn and Novak, 1989;Howard, 1996Howard, , 2000. In an upper-middle Eocene (Uintan) portion of the Sespe Formation (Whistler and Lander, 2003), comparison of the petrology of orthoquartzite clasts with that of orthoquartzites in likely source regions demonstrates a strong tie to the Ediacaran-Lower Cambrian Stirling, Wood Canyon, and Zabriskie Formations to the NW of the miogeoclinal hinge zone, and to the Lower Cambrian Tapeats Sandstone on the craton (Howard, 2000). Although these units occur locally within the eastern arc as metamorphosed wall rocks, preservation of unmetamorphosed sections is largely restricted to the retroarc belt.…”

Section: Provenancementioning

confidence: 99%

The California River and its role in carving Grand Canyon

Wernicke

2011

Geological Society of America Bulletin

112

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Recently published thermochronological and paleoelevation studies in the Grand Canyon region, combined with sedimentary provenance data in both the coastal and interior portions of the North American Cordillera, place important new constraints on the paleohydrological evolution of the southwestern United States. Review and synthesis of these data lead to an interpretation where incision of a large canyon from a plain of low elevation and relief to a canyon of roughly the length and depth of modern Grand Canyon occurred primarily in Campanian time (80-70 Ma). Incision was accomplished by a main-stem, NE-fl owing antecedent river with headwaters on the NE slope of the North American Cordillera in California, referred to herein after its source region as the California River. At this time, the river had cut to within a few hundred meters of its modern erosion level in western Grand Canyon, and to the level of Lower Mesozoic strata in eastern Grand Canyon. Subsequent collapse of the head waters region into a continental border land and coeval uplift of the Cordilleran foreland during the Laramide orogeny reversed the river's course by Paleogene time. After reversal, its terminus lay near its former source regions in what is now the Western Transverse Ranges and Salinian terrane. Its headwaters lay in the ancient Mojave/Mogollon Highlands region of Arizona and eastern California, apparently reaching as far northeast as the eastern Grand Canyon region. This system is herein referred to after its source region as the Arizona River. From Paleogene through late Miocene time, the interior of the Colorado Plateau was a closed basin separated from the Arizona River drainage by an asymmetrical divide in the Lees Ferry-Glen Canyon area, with a steep SW fl ank and gently sloping NE fl ank that drained into large interior lakes, fed primarily by Cor dilleran/Rocky Mountain sources to the north and west, and by recycled California River detritus shed from Laramide uplifts on the plateau. By Oligocene time, the lakes had largely dried up and were replaced by ergs. By mid-Miocene time, a pulse of unroofi ng had lowered the erosion level of eastern Grand Canyon to within a few hundred meters of its present level, and the Arizona River drainage below modern Grand Canyon was deranged by extensional tectonism, cutting off the supply of interior detritus to the coast. Increasing moisture in the Rocky Mountains in late Miocene time reinvigorated fl uvio lacustrine aggradation NE of the asymmetrical divide, which was fi nally overtopped between 6 and 5 Ma, lowering base level in the interior of the plateau by 1500 m. This event reintegrated the former Arizona drainage system through a cascade of spillover events through Basin and Range valleys, for the fi rst time connecting sediment sources in Colorado with the coast. This event, combined with the intensifi cation of summer rainfall as the Gulf of California opened, increased the sediment yield through Grand Canyon by perhaps two orders of magnitude from its Miocene nadir, giving birth t...

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Section: Provenancementioning

confidence: 99%

The California River and its role in carving Grand Canyon

Wernicke

2011

Geological Society of America Bulletin

112

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“…Of these, only one, the sciurid Petauristodon, is known from Thomas Farm. However, the first appearance of Petauristodon is now known to have occurred earlier than the He2 (Whistler and Lander, 2003;MacFadden et al, 2014). Furthermore, fossils of the presumptive He2 taxon Petauristodon occur in the same or lower beds at Thomas Farm as the He1 taxa Menoceras and Floridaceras (see Appendix 1).…”

Section: Thomas Farmmentioning

confidence: 99%

A Late Miocene occurrence of the extinct salamander Batrachosauroides (Caudata, Batrachosauroididae) and other new caudate fossils from Florida and Georgia, USA

Bourque,

Stanley,

Hulbert

2023

FLMNH

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Two partial vertebrae of the rare, large-bodied, aquatic salamander Batrachosauroides are reported from the Upper Miocene Love Bone Bed (late Clarendonian, ~10-9 Ma) Alachua County, Florida. They represent the latest occurrence of Batrachosauroides by 2.8-5.8 million years from previous records and are the latest account of the family Batrachosauroididae in the eastern United States, being either younger than or approximately coeval with fossils of Peratosauroides problematica from the Clarendonian San Pablo Formation of central California. While most Neogene Batrachosauroides in North America are from the warm interval spanning the Late Oligocene Warming (LOW) to the Middle Miocene Climatic Optimum (MMCO), this is the first unequivocal account well after the conclusion of the MMCO suggesting Florida was a post-MMCO refugium during global cooling in the Late Miocene. Batrachosauroides vertebrae from the late Hemingfordian Suwannee Springs site (Florida) and the late Barstovian Gragg Mine (southwestern Georgia) are also described. Two other caudate taxa are present at the Love Bone Bed, Ambystoma and a mid-sized Siren that is the most common amphibian in the Love Bone Bed Local Fauna. The presence and rarity of Ambystoma further corroborates the existence of peripheral or seasonal lentic aquatic habitats adjacent to the main lotic body of the Love Bone Bed deposit. Other salamanders from the paleocoastal Gragg Mine Local Fauna include Notophthalmus and Amphiuma n. sp., aff. Amphiuma pholeter. The latter represents the oldest record of the A. pholeter lineage and documents its presence in the Gulf Coastal Plain since the Middle Miocene. The Gragg Mine represents a unique interval in the southeast at the conclusion of the MMCO.

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Early Pleistocene leporids (Mammalia, Lagomorpha) of Roland Springs Ranch Locality 1 and the rise of North American Quaternary leporines

Moretti

2018

Quaternary International

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Chapter 11

Cited by 16 publications

References 14 publications

The California River and its role in carving Grand Canyon

The California River and its role in carving Grand Canyon

A Late Miocene occurrence of the extinct salamander Batrachosauroides (Caudata, Batrachosauroididae) and other new caudate fossils from Florida and Georgia, USA

Early Pleistocene leporids (Mammalia, Lagomorpha) of Roland Springs Ranch Locality 1 and the rise of North American Quaternary leporines

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