Tell us about the dinosaurs

[Anomalocaris]

Megnetic reversal normally happens once every few hundred thousand years without correlation to extinction i know of. But Looking at a time-polarity plot of the earth's magnetic field, there seems to be anomalous periods where the polarity magnetic fields remain unchanging for tens of millions of years. One seem to last 40 million years in upper Cretaceous starting roughly with the emplacements of Ontong Java Igneous province, another seems to last 50 million years right through the emplacements of Emaishan trap, but ending roughly when Siberian traps were emplaced. However there seems to be no such period clearly associated with emplacements of Deccan trap or Columbia River trap. So on first glance I might say the coincidence between emplacements of LIP and long periods of anomalous polar stability is accidental. Orogenicman?