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Merced River

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River network map in the Merced River region. Values represent incision depths since the specified time (* = maximum possible depth; actual depth could be less). Isopach line for Mehrten Formation deposits is from Slemmons (1966). See Figure 1 for location. Oligo.—Oligocene; Plio.—Pliocene.

River network map in the Merced River region. Values represent incision dep... Open Access

Published: 03 April 2025
Figure 3. River network map in the Merced River region. Values represent incision depths since the specified time (* = maximum possible depth; actual depth could be less). Isopach line for Mehrten Formation deposits is from Slemmons (1966) . See Figure 1 for location. Oligo.—Oligocene; Plio
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Knickpoint heights in the Merced River watershed. See Figure 1 for location. Knickpoint heights do not increase monotonically upstream. Gray envelope shows the extent of the deep Yosemite Valley–Tenaya Canyon trough where the preglacial relief approached 700 m (Matthes, 1930). Although the extent of the Last Glacial Maximum is shown here, an earlier valley glacier terminated at the contact between the metamorphic and granitic bedrocks. The metamorphic terrain surrounding the lower Merced River is highly dissected, suggesting that the deep incision in the Yosemite Valley–Tenaya Canyon continued down the length of the Merced River. na—not measured because of a lithological knickpoint.

Knickpoint heights in the Merced River watershed. See Figure 1 for locati... Open Access

Published: 03 April 2025
Figure 5. Knickpoint heights in the Merced River watershed. See Figure 1 for location. Knickpoint heights do not increase monotonically upstream. Gray envelope shows the extent of the deep Yosemite Valley–Tenaya Canyon trough where the preglacial relief approached 700 m ( Matthes, 1930
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Merced River paleofan. Perhaps in the late Pliocene and early Pleistocene, the Merced River flowed southward and carved a wide valley through its fan (dashed arrow). This southerly course appears to have been cut off by piracy from a westward-flowing stream to establish the modern reach (solid arrow). General location of this site coincides with the lithological profile (Fig. 3). Inset: Topographic profile up the Merced paleofan (solid line on map). Dashed line approximates the paleofan's original surface.

Merced River paleofan. Perhaps in the late Pliocene and early Pleistocene, ... Open Access

Published: 03 April 2025
Figure 7. Merced River paleofan. Perhaps in the late Pliocene and early Pleistocene, the Merced River flowed southward and carved a wide valley through its fan (dashed arrow). This southerly course appears to have been cut off by piracy from a westward-flowing stream to establish the modern reach
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Discharge and bed stress calculations for the Merced River in the vicinity ... Available to Purchase

Published: 01 November 2013
Table 2. Discharge and bed stress calculations for the Merced River in the vicinity of Happy Isles.
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Stratigraphic column of riverbank sediments adjacent to the Merced River downstream of Stoneman Bridge. Two charcoal fragments between 1207.0 and 1207.5 m elevation yield calibrated radiocarbon ages between 10.5 and 11.7 kyr B.P. Radiocarbon ages and stratigraphic column are courtesy of G. F. Wieczorek (pers. commun., 1999).

Stratigraphic column of riverbank sediments adjacent to the Merced River do... Available to Purchase

Published: 01 November 2013
Figure 9. Stratigraphic column of riverbank sediments adjacent to the Merced River downstream of Stoneman Bridge. Two charcoal fragments between 1207.0 and 1207.5 m elevation yield calibrated radiocarbon ages between 10.5 and 11.7 kyr B.P. Radiocarbon ages and stratigraphic column are courtesy
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Figure 5. Profile from the rock-fall release (west) to Merced River (east) (msl—mean sea level). Features shown schematically include calculated trajectory of the rock fall, impact, low ridge from prehistoric rock fall, and travel of airblast and sandy cloud toward Happy Isles Nature Center. Note that the initial point of the profile (x = 0) begins 20 m to the west of rock-fall release; consequently, the impact (x = 500) along the profile indicates a distance from release to impact of 480 m.

Figure 5. Profile from the rock-fall release (west) to Merced River (east) ... Available to Purchase

Published: 01 January 2000
Figure 5. Profile from the rock-fall release (west) to Merced River (east) (msl—mean sea level). Features shown schematically include calculated trajectory of the rock fall, impact, low ridge from prehistoric rock fall, and travel of airblast and sandy cloud toward Happy Isles Nature Center. Note
Journal Article

POST-PLIOCENE UPLIFT OF THE SIERRA NEVADA, CALIFORNIA Available to Purchase

F. S HUDSON
Journal: GSA Bulletin
Published: 01 November 1960
GSA Bulletin (1960) 71 (11): 1547–1574.
DOI: https://doi.org/10.1130/0016-7606(1960)71[1547:PUOTSN]2.0.CO;2
...F. S HUDSON Abstract Matthes determined the position of three ancestral stages of the upper Merced River by projecting the gradients of hanging-valley tributaries to points above the present main stream. From the gradients of the two older stages he concluded that the Sierra Nevada range had been...
View PDF for article title, POST-PLIOCENE UPLIFT OF THE SIERRA NEVADA, CALIFORNIA
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Journal Article

Regional-scale assessment of a sequence-bounding paleosol on fluvial fans using ground-penetrating radar, eastern San Joaquin Valley, California Available to Purchase

George L. Bennett, V, Gary S. Weissmann, Gregory S. Baker, David W. Hyndman
Journal: GSA Bulletin
Published: 01 May 2006
GSA Bulletin (2006) 118 (5-6): 724–732.
DOI: https://doi.org/10.1130/B25774.1
... on the Tuolumne and Merced River fans may indicate less paleochannel activity on these fan surfaces during the last outwash event. Differences in channel activity between fans indicate that the Kings River migrated across its fan during the last outwash event, as evidenced by the large number of areas...
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View PDF for article title, Regional-scale assessment of a sequence-bounding paleosol on fluvial fans using ground-penetrating radar, eastern San Joaquin Valley, California
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Journal Article

Barite and witherite from near el portal, mariposa county, california Available to Purchase

A. A. Fitch
Published: 01 October 1931
American Mineralogist (1931) 16 (10): 461–468.
...A. A. Fitch Abstract The deposits to be described comprise a group of north-south veins outcropping on both sides of the Merced River (though more abundant to the south), near El Portal, the entrance to Yosemite National Park on the All-Year Highway. They have been traced for a mile to the north...
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Journal Article

Is drainage reorganization a plausible explanation for late Cenozoic incision of Yosemite Valley and within the Kings and Kaweah watersheds (Sierra Nevada, California)? Open Access

Emmanuel J. Gabet
Journal: Geosphere
Published: 03 April 2025
Geosphere (2025) 21 (3): 332–351.
DOI: https://doi.org/10.1130/GES02726.1
...Figure 3. River network map in the Merced River region. Values represent incision depths since the specified time (* = maximum possible depth; actual depth could be less). Isopach line for Mehrten Formation deposits is from Slemmons (1966) . See Figure 1 for location. Oligo.—Oligocene; Plio...
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View PDF for article title, Is drainage reorganization a plausible explanation for late Cenozoic incision of Yosemite Valley and within the Kings and Kaweah watersheds (Sierra Nevada, California)?
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Journal Article

Rainfall Thresholds for Post-Fire Debris-Flow Generation, Western Sierra Nevada, CA Available to Purchase

Chad K. Neptune, Jerome V. Degraff, Christopher J. Pluhar, Jeremy T. Lancaster, Dennis M. Staley
Published: 24 November 2021
Environmental & Engineering Geoscience (2021) 27 (4): 439–453.
DOI: https://doi.org/10.2113/EEG-D-21-00039
... and the 2019 Briceburg Fire in the lower Merced River Canyon near Yosemite National Park, CA. During our monitoring, which spanned the period between November 2018 and May 2020, our study basins produced 26 debris flows in response to 60 rainstorms. The corresponding peak rainfall intensity data were used...
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Journal Article

The Sullivan Creek terrane: A composite Jurassic arc assemblage, western Sierra Nevada metamorphic belt, California Available to Purchase

CHARLES T. HERZIG, WARREN D. SHARP
Journal: GSA Bulletin
Published: 01 October 1992
GSA Bulletin (1992) 104 (10): 1292–1300.
DOI: https://doi.org/10.1130/0016-7606(1992)104<1292:TSCTAC>2.3.CO;2
...CHARLES T. HERZIG; WARREN D. SHARP Abstract Metavolcanic and volcaniclastic rocks of the Sullivan Creek terrane in the Merced River region of the western Sierra Nevada metamorphic belt are the remnants of a submarine magmatic arc of Jurassic age. Metasedimentary assemblages consist predominantly...
View PDF for article title, The Sullivan Creek terrane: A composite Jurassic arc assemblage, western Sierra Nevada metamorphic belt, California
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Journal Article

Destruction of plagioclase twins by stream transport Available to Purchase

Edward D. Pittman
Published: 01 December 1969
Journal of Sedimentary Research (1969) 39 (4): 1432–1437.
DOI: https://doi.org/10.1306/74D71E4C-2B21-11D7-8648000102C1865D
...Edward D. Pittman Abstract Merced river, California GeoRef, Copyright 2008, American Geological Institute. 1969 ...
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Proposed drainage reorganization in the Tuolumne and Merced watersheds. Time intervals are approximate. Southern portion of volcanic edifice is shown in red; lighter colors represent thinner Mehrten Formation (Tm) deposits. (A) In pre-Miocene times, the Stanislaus and Merced River networks may have been in approximately the same configurations as the modern networks (Gabet, 2021). The ancestral Tuolumne River network, however, was substantially different than today's network (Huber, 1990). (B) In the Miocene, volcanic material erupting from vents in the headwaters of the Stanislaus River extended southward, reaching across the Merced watershed's drainage divide and establishing a hydrological connection between the volcanic edifice and the Merced watershed. Increased flow and sediment from the edificial river incised Tenaya Creek and Yosemite Valley, with the fluvially reworked Mehrten Formation sediment eventually being deposited in the Merced River's fan. (C) In the late Miocene–early Pliocene, when the edge of the volcanic edifice eroded northward, its runoff was routed into the Tuolumne River watershed and incised the south-flowing tributaries. The increased runoff may have also contributed to incision of the Grand Canyon of the Tuolumne (GCT). (D) Remnants of the volcanic edifice persist in the Tuolumne and Stanislaus watersheds.

Proposed drainage reorganization in the Tuolumne and Merced watersheds. Tim... Open Access

Published: 03 April 2025
Figure 15. Proposed drainage reorganization in the Tuolumne and Merced watersheds. Time intervals are approximate. Southern portion of volcanic edifice is shown in red; lighter colors represent thinner Mehrten Formation (Tm) deposits. (A) In pre-Miocene times, the Stanislaus and Merced River
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A view looking downstream at the Ferguson rock slide. The channel of the Merced River is seen in the foreground, with the unburied part of California Highway 140 on the left and the one-lane road for the detour on the right. The lighter brown strip along the base of the headscarp was created by the 2006 reactivated movement. The accumulated talus extends from within the Merced River channel to the exposed toe of the Ferguson slide mass, which serves as the source of individual rocks and small rockfall events. (Photo by Jerome De Graff.)

A view looking downstream at the Ferguson rock slide. The channel of the Me... Available to Purchase

Published: 01 May 2019
Figure 2. A view looking downstream at the Ferguson rock slide. The channel of the Merced River is seen in the foreground, with the unburied part of California Highway 140 on the left and the one-lane road for the detour on the right. The lighter brown strip along the base of the headscarp
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Figure 4. Interpreted ground-penetrating radar (GPR) lines on (A) the Kings River fan and (B) the Tuolumne and Merced River fans showing the distribution of the Riverbank paleosol and locations of breaks through this paleosol. The background map shows locations of channel and overbank deposits interpreted from soil textures (Weissmann et al., 2002a). Numbers show locations of GPR profiles in Figures 5 and 6.

Figure 4. Interpreted ground-penetrating radar (GPR) lines on (A) the Kings... Available to Purchase

Published: 01 May 2006
Figure 4. Interpreted ground-penetrating radar (GPR) lines on (A) the Kings River fan and (B) the Tuolumne and Merced River fans showing the distribution of the Riverbank paleosol and locations of breaks through this paleosol. The background map shows locations of channel and overbank deposits
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Figure 1. A: In Yosemite Valley, 600 m sediment-filled overdeepening occurs downstream of confluence of Tenaya and Merced Rivers (Gutenberg et al., 1956). Smaller tributaries hang above trunk stream. B: Prospect Canyon has stepped profile and contains numerous lakes. Tributaries hang above trunk, some joining trunk near lakes

Figure 1. A: In Yosemite Valley, 600 m sediment-filled overdeepening occur... Available to Purchase

in Reply > Geology
Published: 01 August 2001
Figure 1. A: In Yosemite Valley, 600 m sediment-filled overdeepening occurs downstream of confluence of Tenaya and Merced Rivers ( Gutenberg et al., 1956 ). Smaller tributaries hang above trunk stream. B: Prospect Canyon has stepped profile and contains numerous lakes. Tributaries hang above
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Figure 3. A–D: Elemental concentrations for riverine suspended-sediment samples from Sacramento River (dark gray) and San Joaquin River (light gray). E: 87Sr/86Sr ratios for same samples. Sacramento drainage samples include SR1, SR2, SR3, and SR4 (main stem of Sacramento River), BC (Battle Creek), and FR (Feather River). San Joaquin drainage samples include SJ1, SJ2, and SJ3 (main stem of San Joaquin River), ST (Stanislaus River), TR1 and TR2 (Tuolumne River), and MR1 and MR2 (Merced River). River-water sampling locations are shown in Figure 1.

Figure 3. A–D: Elemental concentrations for riverine suspended-sediment sam... Available to Purchase

Published: 01 June 2002
Creek), and FR (Feather River). San Joaquin drainage samples include SJ1, SJ2, and SJ3 (main stem of San Joaquin River), ST (Stanislaus River), TR1 and TR2 (Tuolumne River), and MR1 and MR2 (Merced River). River-water sampling locations are shown in Figure 1 .
Image
Figure 1. A: In Yosemite Valley, 600 m sediment-filled overdeepening occurs downstream of confluence of Tenaya and Merced Rivers (Gutenberg et al., 1956). Smaller tributaries hang above trunk stream. B: Prospect Canyon has stepped profile and contains numerous lakes. Tributaries hang above trunk, some joining trunk near lakes. LGM—last glacial maximum.

Figure 1. A: In Yosemite Valley, 600 m sediment-filled overdeepening occurs... Available to Purchase

Published: 01 November 2000
Figure 1. A: In Yosemite Valley, 600 m sediment-filled overdeepening occurs downstream of confluence of Tenaya and Merced Rivers ( Gutenberg et al., 1956 ). Smaller tributaries hang above trunk stream. B: Prospect Canyon has stepped profile and contains numerous lakes. Tributaries hang above trunk
Image
Figure 6. (A) A typical ground-penetrating radar (GPR) profile (50 MHz antennas) from the Tuolumne River fan showing signal attenuation at the Riverbank paleosol (marked with an arrow). The prominent diffractions (hyperbolas) observed along this line represent reflections caused by passing under overhead power lines or over irrigation canals. (B) Typical GPR profile (50 MHz antennas) from the Merced River fan showing signal attenuation at the Riverbank paleosol. Deeper signal penetration on the southern end of this profile shows a possible deep channel incision.

Figure 6. (A) A typical ground-penetrating radar (GPR) profile (50 MHz ante... Available to Purchase

Published: 01 May 2006
overhead power lines or over irrigation canals. (B) Typical GPR profile (50 MHz antennas) from the Merced River fan showing signal attenuation at the Riverbank paleosol. Deeper signal penetration on the southern end of this profile shows a possible deep channel incision.