From 
 Fred Hembeck.Com:

“From METAMORPHO #7 (July-August 1966), our hero and his two companions stumble across evidence that ANOTHER [Bob] Haney-scripted adventurer had left his mark, fittingly, on the inside wall of a volcano.”
Cave Carson starred in the 
“Inside The Earth” series in 
BRAVE AND THE BOLD (numbers 
31, 
32 , and 
33 from 1960, and 
40, 
41 from a year later) and 
SHOWCASE (numbers 
48, 
49, and 
52 from 1964) where he and his colleagues explored the inner Earth ala the heroes of 
Jules Verne’s  “Journey to the Center of the Earth” and 
Edgar Rice Burrough’s “Pellucidar” stories.  In the 1960’s the Cave Carson stories were the closest things one could get to comics featuring palaeontologists.  Someone should put out a compilation of these excellent and fun stories.  I'd bet good money that the palaeoblogger's good friend, 
Mark Schultz, could have his arm twisted to do a wonderful new cover for the collection.