Stanislaus River System — Sediment Sequence DPS-017 to DPS-020

Jan 1
4 min read

Stanislaus River System

Location: Knights Ferry → Woodward Reservoir, California

System: Stanislaus River / Sierra Nevada

Sample Set: DPS-017 to DPS-020

Sites: 2 (Knights Ferry · Woodward Reservoir)

Samples: 4

Focus: Sediment transport sequence

System States: Transport · Storage · Deposition · Lithification

Material: Quartz-dominant fluvial sediment with mafic fragments

Field Method: Direct collection · visual inspection · comparative analysis

Linked System: Deep Time — Stanislaus River System

Status: Field-collected and interpreted within system context

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Collection Overview — Stanislaus River System

Sediment eroded from the Sierra Nevada moves through a sequence of transport, storage, redistribution, and deposition. These samples capture that progression across a single system—from active river channel to early-stage rock formation within the reservoir.

Illustrated cross-section diagram of the Stanislaus River system showing sediment moving from the Sierra Nevada through river transport, bank storage, reservoir margin deposition, and formation of early-stage rock. — Stanislaus River sediment progression from the Sierra Nevada through Knights Ferry to Woodward Reservoir, showing the transition from active transport to early lithification.

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DPS-017 Knights Ferry (Wet Channel) — Foothill Transition Zone

System State: Active Transport

Material Description:

Loose, uncemented sediment
Poor to moderate sorting (mixed grain sizes)
Sub-angular grains with limited rounding
Quartz-dominant with dark mafic fragments and minor iron staining

Process Interpretation:This material is actively transported by the Stanislaus River under relatively high-energy conditions. Grain angularity and mixed sizes indicate ongoing movement with limited reworking or long-distance transport.

System Role: Sediment in motion

Close-up microscope image of loose, mixed-size sand grains from a river channel, including angular quartz and dark mineral fragments, indicating active transport conditions. — Quartz-rich sediment actively transported through the Stanislaus River at Knights Ferry, representing high-energy fluvial movement from the Sierra Nevada.

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DPS-018 Knights Ferry (Bank) — Temporary Storage Zone

System State: Short-Term Storage

Material Description:

Loose sand with slight compaction
Moderately mixed grain sizes
Sub-angular to sub-rounded grains
Similar quartz-rich composition with minor oxidation

Process Interpretation:Deposited during higher flow conditions and left behind as water levels recede. Exposure leads to drying, minor sorting, and early surface weathering, but the material remains easily reactivated by future flow.

System Role: Sediment paused, not settled

Close-up image of dry sand with mixed grain sizes and partial rounding, showing sediment that has been deposited and exposed along a riverbank. — Riverbank sediment temporarily stored above the active channel at Knights Ferry, deposited during higher flow and exposed during lower water levels.

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DPS-019 Woodward Reservoir

alluvial plain / race course terrain

Woodward Reservoir (Course Surface) — Transitional Margin

System State: Deposition + Reworking

Material Description:

Loose to lightly compacted sediment
Mixed grain sizes with fine material filling gaps
Quartz grains with dark mineral fragments and organic inclusions
No true cementation

Process Interpretation:Sediment deposited during high water stages is later exposed during reservoir drawdown. Fluctuating conditions introduce drying, minor redistribution, and surface disturbance, creating a mixed and unstable deposit.

System Role: Sediment in transitionn

Close-up image of mixed sediment including sand grains, dark mineral fragments, and organic material, indicating exposed reservoir margin conditions. — Transitional sediment on the Woodward Reservoir course, shaped by fluctuating water levels, exposure, and surface reworking.

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DPS-020 Woodward Reservoir (Shoreline Rock) — Low-Energy Depositional Zone

System State: Early Lithification

Material Description:

Quartz-rich with iron-stained matrix
Patchy cementation
Smooth, water-polished surface

Process Interpretation:Reduced water energy allows suspended sediment to settle and remain in place. Over time, chemical binding and compaction begin to stabilize the material, while shoreline processes smooth and modify the surface.

System Role: Sediment becoming rock

Close-up image of compact, fine-grained sediment with iron staining and smooth surface texture, showing early lithification along a reservoir shoreline. — Reservoir shoreline material where settled sediment has begun to bind and transition into early-stage sandstone.

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System Sequence

This collection captures a complete sedimentary progression:

Location	System State	Process
Knights Ferry (Wet)	Active	Transport
Knights Ferry (Bank)	Intermediate	Temporary Storage
Woodward Course	Transitional	Deposition + Reworking
Woodward Shoreline	Settled	Early Lithification

Core Interpretation

Sediment eroded from the Sierra Nevada is transported through the Stanislaus River, temporarily stored along riverbanks, redistributed across reservoir margins during fluctuating water levels, and ultimately deposited and bound into early-stage rock within the low-energy environment of Woodward Reservoir.

This is not just a set of samples—it is a continuous system captured in stages

Movement>Pause>Redistribution>Settlement

Summary

This collection captures the Stanislaus River system in sequence—from high-energy transport at Knights Ferry, to temporary storage along the banks, to redistribution across the Woodward Reservoir margins, and finally to early-stage lithification along the shoreline. Each sample marks a point in that progression, showing how material from the Sierra Nevada moves, settles, and begins to become rock.

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Deep Time | Race Review | Night Sky Archive

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References

Blair, T. C., & McPherson, J. G. (1994). Alluvial fans and their natural distinction from rivers based on morphology, hydraulic processes, sedimentary processes, and facies assemblages. Journal of Sedimentary Research, 64(3a), 450–489. https://doi.org/10.1306/D4267DDE-2B26-11D7-8648000102C1865D

Knighton, D. (1998). Fluvial forms and processes: A new perspective. Arnold.

Mack, S., & Saucedo, G. J. (1988). Geologic map of the Oakdale quadrangle (Regional Geologic Map Series, Map No. 4A, scale 1:250,000). California Division of Mines and Geology.

Ransome, F. L. (1898). Some lava flows of the western slope of the Sierra Nevada, California. U.S. Geological Survey Annual Report, 18(Part 2), 471–492. https://doi.org/10.3133/ar18_2

Wakabayashi, J., & Sawyer, T. L. (2001). Stream incision, tectonics, uplift, and evolution of topography of the Sierra Nevada, California. Journal of Geology, 109(5), 539–562. https://doi.org/10.1086/321962

Reference Notes

Notes drawn from a linked working system spanning field observation, sample collection, and geological interpretation.

Hand Sample Clock: Which Lab Methods Answer Which Time Questions

Sampling a Stratigraphic Section — What to Collect to Resolve Time and Process

Bounding ranges as active ingredients — Sierra and Coast Range uplift/tilt set gradients, drainage, and sediment routing into the Valley (Howard, 1979)

Faulting as a hydro-geomorphic control — tectonic structures steer rivers, influence incision, and localize floodplain behavior (Harwood & Helley, 1987)

Foothills roadside signature — bedrock control appears where rivers leave the Sierra and cut resistant arc rocks (Alt & Hyndman, 2000)

Sacramento Valley terraces — stepped surfaces as time-slices of river incision and fan building (Alt & Hyndman, 2000)

Terraces and fans as time slices — Quaternary surfaces organize relative age and river history in the Oakdale region (Marchand & Allwardt, 1981)