# 82 Strata Descent

**Idea.** Depth is both the navigation and the argument of the archive.

**Composition.** A continuous geological section descends from chalk through ochre and rust to blue-black. Depth markers and embedded artefacts replace a conventional page grid.

**Navigation and complete example.** Descend through six invented layers of a former railway site, examine a found object in each and collect a cross-section of findings.

**Responsive and inclusive behaviour.** Depth markers stay in a narrow rail; content occupies the remaining width. All strata have labelled anchor links, so scrolling distance is optional. All controls are native buttons or labelled inputs. Movement is discretionary, no sound starts automatically, reduced-motion preferences remove transitions, and a direct index exposes the same content.

**Adaptation.** Use depth for meaningful chronology or scale, not merely a long scroll. Clearly distinguish fictional findings from research evidence. Retain the relationship between navigation and content. Do not reduce the reference to a generic hero followed by interchangeable cards.

**Research.** [Neal Agarwal — The Deep Sea](https://neal.fun/deep-sea/). These are conceptual precedents, not copied artwork, source code, branding or text. All diagrams and sample writing in this specimen are original, fictional material.

## Defining patterns

- Depth navigation
- Embedded artefacts
- Cross-section collection

## Routes

- Entry: /preview/82-strata-descent/start
- An excavated artefact: /preview/82-strata-descent/artefact
- Collected cross-section: /preview/82-strata-descent/section

## Implementation and assets

The independent Vue component owns its layout and interaction. Only history navigation and optional local storage come from useSpecimen.ts. The ZIP contains the helper, runnable project, fonts, original source, all captures and their checksums. Local font files retain their OFL notices. CSS/SVG artwork is MIT; any photographs retain the notices in assets.json and THIRD_PARTY.md.