World State — Protohistoric Expansion Era (Representative Glacial Maximum)

Summary

A time-specific baseline snapshot of real-world Earth conditions during the Protohistoric Expansion Era, representing a glacial maximum. Defines the geography, climate, species, and ecological constraints that all lore set in this era must obey.

Metadata

Primary topic: World State — Protohistoric Expansion Era (Representative Glacial Maximum)
Layer: Real-world reference
Topics: geography, climate, Sahul, glacial maximum, sea level, refugia, movement corridors, megafauna, large predators, honeypot ants, aphids
Time periods: Protohistoric Expansion Era
Real-world period: Early Pleistocene
Real-world anchor: ~2 MYA
Reference window: representative glacial maximum
Regions: Sahul (Australia, New Guinea, Tasmania, exposed continental shelves)

Core Reality

Sea level is approximately 100 metres lower than present in this representative glacial maximum.
Australia, New Guinea, Tasmania, and exposed continental shelves form the broader Sahul landmass. Modern coastlines do not apply.
The Torres Strait area and Arafura Shelf support land connectivity between northern Australia and New Guinea.
The Gulf of Carpentaria is not equivalent to its modern marine form; it may function as exposed lowland, basin, or seasonal wetland depending on local conditions.
Deep-water channels between Sahul and the Indonesian island chain persist even at glacial maximum sea levels. The westward crossing toward Indonesia remains a significant barrier.
Early Pleistocene glacial cycles occur roughly every 40,000 years. Glacial maximum conditions are generally cooler and often drier than interglacial periods.
New Guinea highlands and other uplands preserve wetter refugia even when lowlands and interiors become drier.
Northern and eastern Australian rainforests contract into limited refugia, corridors, or upland pockets.
Productive zones are patchy and uneven across Sahul.
Megafauna herbivores — including diprotodontid or Diprotodon-like animals — are present and impose landscape pressure.
Large predators — including marsupial lion-like predators — affect safety, route planning, and settlement location.
Honeypot ants and sap-feeding insects are present; their ecological relationships constrain sugar, orchard, and preservation systems.
Grain-based agriculture is not the baseline food system for this setting. Orchard, forest, wetland, and refugia ecosystems are more relevant baseline constraints.

Constraints

Modern coastal geography must not be assumed for settlement, travel, or resource access; real coastlines are far inland from modern positions.
Productive zones are spatially fragmented; large continuous agricultural regions cannot be assumed.
Interior regions become less suitable for continuous orchard-based settlement during glacial maxima.
Settlement and infrastructure built on exposed shelf land faces inundation as sea level rises during subsequent interglacials; shelf settlement is not permanently viable.
Long-distance movement is constrained to corridors — exposed shelves, uplands, river systems, coastlines — not open uniform terrain.
Megafauna herbivores impose sustained vegetation pressure and movement risk; they cannot be ignored in landscape use.
Large predators impose real safety constraints on settlement location, route selection, and travel party requirements.
Insect-mediated food systems are viable only where host plants, insects, and storage or preservation practices remain stable enough to support them.

System Implications

Political and transport systems must respond to regional ecological discontinuity; uniform continental development cannot be assumed.
Settlement viability depends on identifying zones that remain productive across multiple glacial phases, not just current conditions.
Transport infrastructure must follow corridors that are stable across climate cycles.
Spatial fragmentation of productive zones makes storage and redistribution systems critical infrastructure, not optional enhancements.
Predator management is a real constraint on where settlement can be placed and how movement occurs, not a background detail.

Known Variability

This is a representative snapshot, not a claim that all conditions are identical across every early Pleistocene glacial cycle.
Conditions vary across elevation, latitude, rainfall regime, and local terrain within any given glacial phase.
The Gulf of Carpentaria and Arafura Shelf behave differently across glacial cycles depending on local topography and sea-level position.
Regional variation in rainfall is significant; some uplands preserve wetter conditions even during regional dry phases.
Lore systems may reference more specific regional variations when needed, provided the variation is justified.

Open Questions

Which Sahul shelf and exposed coastal plain regions remain productive enough for orchard-capable ecologies during representative glacial maxima?
Which upland, volcanic, or river-corridor regions provide the earliest continuous agricultural viability under Protohistoric Expansion Era climate conditions?
Which exposed land corridors create durable transport chokepoints rather than short-lived seasonal routes?

Cassowary World