When Did the Dust Settle?

A Wind-Driven Depositional Model for Post-Catastrophe Stratigraphy

Part One of the Deposition Series

The geological column looks like time. It could also look like a wind-sorting sequence under catastrophic conditions. The physics does not care which story you prefer.

This paper derives what the cork-pop event should leave in the rocks: an erosion surface, a debris pile, and then a fining-upward stack sorted by a decaying wind-driven flow. It does not re-derive the velocity profile or the heat budget. Those live in the Trigger standalone. It does not publish a surface-temperature field. That waits on a climate model. What it uses is the consequence of the geometry the Trigger already owns — a steep thermal and moisture contrast between the new rift basins and the cooler remnant ocean and continents — and the ordinary meteorological result of such a gradient.

Paper 2 tests the predictions against published sections. This paper commits to them first.

1. What this paper takes from the prior work

The Diversification Series supplied a date window from private mutational load divided by a measured germline rate: 4,725 to 7,200 years. That window is not a tectonic output. The Trigger standalone supplied the mechanism that has to finish inside that window: lithospheric shell failure, cork-pop geometry, and a velocity history. Opening starts at 12 km/yr and decays exponentially with a time constant of 417.5 years:

v(t) = 12 × e^(−t / 417.5)

where t is years after the tear and v is the full opening rate in km/yr. At one time constant the rate has fallen to about 4.4 km/yr. The integral of that curve is about 5,000 km of separation, and the tail heads toward the modern few centimeters per year. The time constant is part of that history. It is not a second calendar.

The same tear opens two new rift basins (Atlantic and Indian) against a remnant Pacific. The new floors are the heat and moisture source. The remnant ocean is not a second furnace. Appendix F of the Trigger fixes how much heat had to leave the new basins to match the measured residual flux. It does not supply a surface-temperature field, and this paper does not add one.

One consequence of that architecture was not followed in the earlier series: the event should deposit a vast, organized sedimentary pile. Grain size, order, direction, and the decay of energy should be readable from the same velocity profile and the same rift-versus-remnant contrast. That is the job here.

2. Two phases, two processes

The velocity history has the shape of a failed pressure vessel: a fast start, then exponential healing. The text of Genesis 7–8 changes character on the same schedule. Mabbul (the violent deluge) ends at day 40. After that the account uses only mayim (waters). This paper treats that shift as a process boundary, not as theology.

Phase A — days 0–40. The shell fails. Peak velocity is about 12 km/yr. Displacement along the failing margins generates continent-scale tsunamis. On the low pre-event surface — relief confined to sutures, ranges not yet built — those flows exceed the mobilization threshold for boulders, cobbles, gravel, sand, silt and clay at once. Nothing settles. Everything moves. The brief tsunami phase breaks material up and shifts it; it does not place the layered column. Where the flow decelerates — paleolows, closed depressions, box canyons, any hole that can hold a load — it dumps what it was carrying as an unsorted mix. Those fills are Phase A’s signature: chaotic, mixed grain sizes, local clasts, no fining-up. That is raw material, not a formation.

Phase B — day 40 onward. The opening continues, but the hydraulic chaos of the first hours is over. Basins are widening, highlands are rising, and the new rifts are already a heat-and-moisture source. Organized deposition begins when the surface is no longer being stripped faster than it can receive a bed: this paper keeps the text’s day-150 grounding / “waters restrained” marker as the practical onset of that regime, not as a fitted parameter. From that point the question is no longer “did the water move everything?” It is “what could the wind-driven flow still carry, and in what order did it drop it?”

Phase B is not a still pond with a breeze on it. The same gradient that drives the mean current also drives storms. Wind setup piles water onto the low continental surface — storm surge — and that surge is part of the sheet flow, not an extra event. For as long as the contrast stays strong, the ocean is swept onto the land repeatedly. Each pulse brings a new load: local debris still in play, and marine sediment and organisms carried in from the adjacent sea. Provenance therefore does not freeze at the tsunami dump. It stays mixed — basement plus ongoing marine feed — through the high-energy window, and only quiets as the surge and the current both decay.

Phase A does not grade the column. Phase B does.

3. The thermal engine

A hot, wet surface next to a cooler, drier one produces wind. That is not a catastrophe-specific invention. It is the same class of engine as a monsoon: differential heating and moisture load a pressure gradient, the gradient drives a low-level flow, and the flow lasts as long as the contrast does.

The Trigger geometry supplies exactly that contrast.

• The new Atlantic and Indian rifts are the furnaces. Fresh mantle-derived floor contacts seawater. The water-side cap keeps the contact from running away; evaporation and latent heat strip energy as it arrives. Appendix F places the active boiling / high-discharge window at roughly 310 to 478 years depending on the water-side flux. That is a duration of strong contrast, not a temperature map.
• The remnant Pacific is old lithosphere. No new crust is emplaced on its floor. It is not the contact surface. This paper assigns it no SST.
• The continents, once highlands exist, are the cool, high side of the same gradient. Cloud, rain, and elevation all work in that direction. No continental temperature field is claimed.

What follows from the gradient, without a climate model:

1. Persistent, directed low-level flow from the cooler side toward the thermal and moisture lows over the rifts — a supercharged monsoon analog, not a global average wind.
2. That flow, acting on a shallow sea sitting on the stripped continental surface, becomes a wind-driven current. Bed stress is set by the wind, the depth, and the fetch.
3. As the rifts come off the boil and the Appendix F tail takes over, the contrast relaxes. Capacity to move coarse grains falls. Fining-upward is the expected sedimentary translation of a decaying gradient.
4. Humidity is part of the engine, not a decoration. The rifts are a moisture source. Rain and sheet flow ride with the wind. Storms on that gradient add surge: the sea itself is pushed onto the shelf and the low interior, again and again, until the contrast relaxes. The same decay that weakens the wind weakens the water budget on the continents and ends the repeated marine sweep.

Until a coupled atmosphere–ocean model is run on the three-basin geometry, this paper claims only the meteorological consequence of a large, declining thermal and moisture gradient, timed to the Trigger heat engine. The schedule is qualitative: contrast is strongest while the rifts are boiling and wide, then declines through the conductive tail. No surface-temperature field is stated.

4. From wind to rock

The translation from gradient to grain is standard sedimentary mechanics. The steps are physics. They are not run here from a temperature field.

1. Thermal and moisture contrast → pressure gradient.
2. Pressure gradient → surface wind.
3. Coriolis sets the deflection, hence paleocurrent direction as a function of hemisphere and latitude.
4. Wind speed → wind stress on the water.
5. Wind stress → depth-averaged current and near-bed velocity.
6. Bed velocity → bed shear stress.
7. Shields parameter → which grain sizes move, and which drop.

What remains usable without a climate model:

• Direction. Northern Hemisphere mid-latitudes: flow deflected to the right of the pressure gradient. For a rift-ward low sitting off the western margin of a Laurentian block, the expected shallow-sea transport is west to southwest. Southern Hemisphere: the opposite deflection.
• Order. Coarse first, fines later, chemical precipitation last, as the gradient — and therefore the bed stress — declines. Threshold crossings, not formation names, are the model output.
• Calibration, not derivation. Paper 2 reads flow depth and bed velocity from the rocks (Tapeats set thickness and grain size). That is an empirical check of whether the flow class is in the right neighborhood.

Shields’ criterion still does the Phase A work that does not depend on climate: on the stripped low surface, tsunami-scale flows put θ above the threshold for the whole grain-size spectrum at once. That is why Phase A is an erosion surface plus a dump, not a graded bed.

5. The sorting engine

Once Phase B is allowed to run, the debris pile is a mixed feed. The wind-driven current is a filter. Fines are not lost on the first pass. Each surge that sheets the ocean back onto the low surface brings silt and clay with it and drops them when that pulse stalls. A single flush to the deep basin would sweep them away; the repeated, decaying sweep keeps returning them to the same shallow water until the engine can no longer keep them moving. That is why they are still present to build the middle of the stack instead of vanishing offshore in year one.

Predicted sequence

Contacts between these packages are gradational where the same water body simply lost energy. They are sharp where a local source, a storm set, or an exposure surface interrupts the decay.

Formation names (Tapeats, Bright Angel, Muav, and their equivalents elsewhere) are not predicted. Threshold crossings are. Paper 2 maps the crossings onto named units.

The schedule of those crossings follows the rift-heat engine, not a second clock: sand while the contrast is still strong (boil and early tail), fines as it relaxes, carbonate when the current has little left to carry. Exact year-labels for each crossing are not claimed. The order is.

6. The Phase A legacy

The erosion surface. Low ground is stripped toward basement. The contact under the first organized bed is a sharp unconformity on irregular paleotopography. That is a Phase A prediction, independent of wind.

The debris pile. Sub-angular to sub-rounded grains, mixed sizes, local basement in the clasts. Expect thick unsorted dumps in depressions and box canyons — places the wave could enter and stall — and a thinner, patchier residue on the highs. No long-distance sand import: a tsunami crossing a continent is not a delivery system for a well-sorted quartz arenite from a thousand kilometers away. Phase B reworks the mobile fraction of what Phase A left nearby. It does not invent the layering out of the tsunami itself.

Basal conglomerate. Confined to paleolows. Absent on the highs. Not remobilized into the sand body above it, because ordinary Phase B sheet flow sits below the threshold for coarse gravel. Composition matches the local basement. A box-canyon fill that is still a mixed dump, with no sand-silt-carbonate order inside it, is Phase A doing what Phase A does. A fining-up stack sitting on that dump is Phase B.

Provenance. Two feeds, on different clocks. The first is the Phase A dump: first-cycle debris from the stripped local surface. Zircons and lithic fragments from that load point at the immediately underlying crust, not at a distant craton dragged in by a single world-current. The second is Phase B recharge: as long as storm surge keeps sweeping the adjacent ocean onto the land, marine sand, carbonate grains, and organisms keep arriving. That feed lasts through the high-contrast window. It does not require the tsunami to still be running. When the surge dies, the marine supply dies with it, and the stack is left to finish on whatever local siliciclastic is still in the basin, then on chemical precipitation. A section that shows only basement clasts from the first pulse and then a sealed, land-only column is not what this engine produces. A section that keeps a marine signature through the sand and into the fines, fading as energy falls, is.

7. The global prediction

The same engine, run at different latitudes and different distances from a rift furnace, should not produce identical stacks. It should produce a family.

Paleolatitude controls direction. Coriolis sign flips across the equator. A Southern Hemisphere shallow sea under the same class of gradient should show the mirror paleocurrent of a Northern Hemisphere one at comparable latitude. That is a blind directional test. It does not consume a temperature.

Proximity to a new rift controls intensity. Sections sitting downwind of the Atlantic or Indian furnace should show thicker, coarser, longer-lived high-energy packages than sections facing only the remnant ocean. The Pacific-facing side of a continent is the weak-engine side. That is a relative prediction: stronger versus weaker, not a meter-per-second field.

The prediction set, stated before Paper 2

1. Basal contact: sharp erosional unconformity on irregular paleotopography.
2. Basal conglomerate: in lows only, local basement, not remobilized into the sand.
3. First organized unit: sand-dominated, dune-scale cross-bedding, mixed local-basement plus ongoing marine feed, sub-angular to sub-rounded grains.
4. Paleocurrent: west–southwest in Northern Hemisphere mid-latitudes on a western-rift geometry; mirror in the Southern Hemisphere.
5. Sand-to-fine transition: gradational, with intermittent sand in the fines decaying upward.
6. Fine-to-carbonate transition: gradational where the same basin simply died as a siliciclastic machine.
7. Fining-upward as a whole-stack property, interrupted only by local storms, seismicity, or exposure.
8. No requirement that every continent-scale section look like the Colorado Plateau. Distance from a furnace and local accommodation will change thickness and the sand/fine ratio. The order of thresholds should recur.

8. The Colorado Plateau as the first place the list can fail

The Grand Canyon’s Tonto Group is the nearest complete, published, shallow-marine stack sitting on a basement unconformity in the right paleogeographic neighborhood (western Laurentia, mid-latitudes, proto-Atlantic side). It is not chosen because it is famous. It is chosen because the predictions above can be read against it without new fieldwork.

Timing is not a Plateau-specific eighth prediction with year-stamps. The stack should occupy the decaying-contrast window — strong early, quiet late — inside the post-event interval. Paper 2 maps named units onto the threshold sequence. It does not inherit year-labels for those units from this paper.

9. What this paper does not claim

• It does not claim a working climate model or a surface-temperature field from which wind and bed velocity have been computed.
• It does not claim that every named Phanerozoic formation is a Phase B product. Disturbed versus undisturbed still applies: where the event did not strip the surface, older order can stand.
• It does not claim continent-scale coherent transport of the pre-event fossil record. Phase A moves and dumps; most fine biostratigraphic order, where it survives, survives because it was not lifted, as the Diaspora reconstruction already stated.
• It does not claim exact formation thicknesses. Thickness is supply × accommodation, which Paper 2 can discuss locally and this paper cannot.
• It does not claim a constant mean wind. The gradient sets a prevailing direction and a decaying capacity; storms ride on top of that.
• It does not date the column. The mutational-load window dates the event. The velocity profile times the decay of the engine. The rocks record threshold crossings.

10. The envelopes

If Paper 2 finds the Tonto Group running the wrong direction, starting with mud, or sitting on a conformable contact, the wind-driven reading of this stack is wrong. The cork-pop mechanism can still stand; this translation of it into sediment would not.

If Paper 2 finds the order, the provenance, and the paleocurrent, that is not proof of the event. It is proof that one well-documented pile looks like the debris-plus-decaying-gradient machine this paper specified. Other basins, other latitudes, and a climate model remain the work.

The dust does not settle on a timetable invented for the rocks. It settles as the rifts stop boiling and the wind loses the contrast that drove it.

© 2026 D. L. White. Licensed under CC BY-ND 4.0. https://creativecommons.org/licenses/by-nd/4.0/

AI Collaboration Disclosure: D. L. White directed the inquiry and made all substantive determinations. Claude (Anthropic) and Grok (xAI) assisted with drafting and review. Neither AI system endorses all conclusions as settled.