L'excursion de Laschamp
Quand le champ magnétique terrestre s'est effondré il y a 42 000 ans, les conséquences biologiques valident la prédiction de susceptibilité magnétique de BERM.
Corrélation paléomagnétique
The Laschamp excursion is well-dated in the paleomagnetic record. The ecological consequences are temporally correlated. BERM's interpretation via CRY/RPM is a hypothesis. This applies equally to conventional explanations.
THE EVENT
When the magnetic shield collapsed
Approximately 42,000 years ago, Earth's magnetic field strength dropped to less than 6% of its current value during the Laschamp geomagnetic excursion.
Cooper et al. (2021) dated this event precisely using radiocarbon calibration from New Zealand kauri trees.
The authors named this period the 'Adams Transitional Geomagnetic Event.'
ECOLOGICAL CONSEQUENCES
A cascade of extinctions
The Laschamp field minimum coincides with megafauna extinctions, Neanderthal disappearance, vegetation shifts, and expansion of cave art.
The ozone layer was significantly depleted during the field minimum.
BERM proposes a complementary mechanism beyond radiation.
BERM INTERPRETATION
Two simultaneous disruptions
From BERM's perspective, the Laschamp excursion tests what happens when B_geo → 0.
When B_geo collapses, the EM shield weakens AND CRY/RPM loses its reference field.
The second effect disrupts circadian timing, melatonin, and reproduction across CRY-dependent organisms.
ISS astronaut data confirms the same physiological signature.
REPRODUCTIVE CONNECTION
Multi-generational magnetic stress
Extended B_geo collapse means sustained CRY/RPM disruption and chronic melatonin suppression.
Multi-generational near-zero field represents cumulative reproductive stress across species.
Falsification criteria
CRY-independent organisms should show less Laschamp-coincident stress.
The pattern should repeat at other geomagnetic excursions.