Sun's Disk Crossing and Extinctions

The Sun's current z position and velocity is ~ 40 pc and 7 km/s giving these (approximate) z excursions.

Theoretical episodic flux of comets caught by Jupiter arising from galaxy tidal perturbations to the Oort cloud, arising from the sun's disk crossing. The period of 36 Myr seems to coincide (weakly) with geologically recorded impacts.