would it be possible to have the date and surveyor using a colorscale instead of using the predefined colors. Could be the same as for depth maybe.
This would give a better render of the timeline I believe and would avoid having twice the same color for different sessions.

aaaahhhhh for date you might be right! probably my colour blindness do me some tricks. (maybe using blue to red color scale would be best)
for surveyors, maybe adding a rule so the same color cannot be used for connected or overlapping (plan view) sessions.

Thanks for that,

First feedback,
- it would be nice to be able to assign depth and date a different colorscales as sometime one colorscale works well with depth but not with dates and reverse.
- Inferno is nice but one end color is too dark for black back ground and the other is too light for with back ground. Maybe keep it but reduce the color range e.g. from the graph you sent, I would remove 2 square on the dark side, and one one the light side.

Also, would it be possible to display the legend in the view. I'm often asked what the colors means... and with multiple colorscale available, it becomes even more important.