---
name: epsl-cover-letter
description: Use when writing the cover letter and editor-facing metadata for an Earth and Planetary Science Letters (EPSL) submission. EPSL is run by a team of subject editors who screen for frontier significance and letters fit, so the letter must land the process-level advance, steer to the right editor, and supply clean suggested reviewers. It drafts the letter; it does not contact editors.
---

# Cover Letter & Editor Pitch (epsl-cover-letter)

EPSL manuscripts are handled by an editor whose own research sits near the paper's sub-field —
geochemistry, geophysics, geodynamics, planetary science (the current editor roster changes;
re-check it on the journal site). Your letter is read by a scientist who can evaluate the claim
directly, so it must be a precise scientific argument for significance, not marketing. Its three
jobs: state the frontier advance, demonstrate letters fit, and make the editor's reviewer search easy.

## When to trigger

- Writing the cover letter for a new EPSL submission
- Choosing the editor whose remit matches the paper (where the system allows a preference)
- Assembling suggested and opposed reviewers with conflict statements
- Re-pitching after a desk decline at another high-bar venue

## What the letter must do

1. **Open with the advance, quantified.** Two or three sentences: the process question, what your
   result establishes, and the number that carries it — written for a scientist-editor, without
   superlatives.
2. **Argue portability explicitly.** One sentence on why readers beyond the study region or method
   community need the result; this is the desk-screen axis regional studies fail.
3. **Show letters fit.** Confirm one decisive result, main text within the cap, no companion
   manuscript in play.
4. **Flag the cross-disciplinary reviewer pairing.** If the paper joins two sub-fields, say so and
   suggest reviewers from each — it tells the editor you understand how EPSL will referee it.
5. **State integrity basics.** Original work, not under consideration elsewhere, all authors approve,
   preprint status if any, data deposited (name the repositories), competing interests declared.
6. **Suggest clean reviewers.** Several qualified names with no recent co-authorship, shared
   institution, or advising ties; opposed reviewers named soberly with a one-line reason if needed.

## The subject editor's silent questions

| Editor asks silently | Weak letter | Letter that survives |
|----------------------|-------------|----------------------|
| Is this a frontier advance? | "we present new data from X" | "this is the first measurement that separates hypothesis A from B, at ±… precision" |
| Will non-specialists care? | portability unstated | "any interpretation of [archive/process] must now correct for…" |
| Is it a Letter? | length/scope unmentioned | "a single result, 5,900-word main text" |
| Can I referee it fairly? | reviewer list from one clique | reviewers spanning both sub-fields, conflicts stated |
| Are the data real and open? | silence | "full tables at EarthChem (DOI), code at Zenodo (DOI)" |

## Worked micro-example (illustrative — pitching the detrital-lag paper)

- **Weak hook (desk-decline risk):** "We report 600 new detrital-zircon U-Pb ages from the X Basin
  together with bedrock thermochronology, and discuss the provenance of the basin fill." An editor
  files this under regional provenance.
- **Strong hook:** "We provide the first direct measurement of the lag between mountain exhumation
  and its appearance in the sedimentary record — 5.0 ± 1.2 Myr (illustrative) — by dating both ends
  of one sediment-routing system. Detrital archives are read worldwide as if this lag were zero; our
  result makes that reading correctable." Process, number, portability — in three sentences.

The conversion move is always the same: replace *what was measured where* with *what everyone else
must now do differently*.

## Anti-patterns

- A letter that inventories the dataset but never states what it decides
- "Novel," "unprecedented," "paradigm" doing the work that a number should do
- Ignoring the regional-study objection when the title contains a place name
- Suggesting only reviewers from the authors' collaboration network
- Omitting data-deposition, preprint, or competing-interest statements
- A letter longer than a page

## Output format

```
【Hook】advance + number + portability in ≤3 sentences
【Letters fit】one result + within cap + no companion paper
【Editor】subject remit matched (re-check current roster)
【Reviewers】suggested (both sub-fields) + conflicts stated; opposed if any
【Integrity】originality / authors / preprint / data DOIs / COI
【Length】one page? [Y/N]
【Next】epsl-review-process
```

## Supplementary resources

- [`../../resources/official-source-map.md`](../../resources/official-source-map.md) — journal home and editor roster (re-check before naming anyone)
- [`../../resources/exemplars/library.md`](../../resources/exemplars/library.md) — abstracts whose significance framing translates to strong hooks