Fountain Paint Pot and nearby thermal features.

This is the Fountain Paint Pot which gave this trail its name.  These "Mudpots" are fairly thick in the late summer but the mud in the middle of this is continuously bubbling and boiling.  It does appear to have the thickness of paint.  This image was cropped from a frame taken with my 10mm fisheye with an exposure of 1/640 sec, f/8, ISO 100.

This is the very noisy Fumaroles.  This hissing fumerole was being outdone this day by its neighbor below, the Red Spouter.  It smelled of sulfur here too. This image was taken with my 10mm fisheye with an exposure of 1/500 sec at f/8, ISO 100.

Red Spouter originated in 1959 with the Hebgen Lake Earthquake.  It was mostly just steaming when we were there, but it apparently changes its typical features during the year from a muddy hot spring in the spring  & early summer to small geyser that splashes reddish water several feet in the air to a big mudpot and then a hissing fumerole.  They sounded like the hissing fumerole the day were were there

Leather Pool has undergone changes in the recent past.  It supported leather-like thermophilic bacteria before the Hebgen Lake Earthquake in 1959 but became boiling after the earthquake, killing off the micro organisms and has since cooled back down.  This image was taken with my 10mm fisheye with an exposure of 1/200 seconds at f/8, ISO 100.