Adventures in Jimland

Yet another exceptional find by Sir Paul at YWW:

http://pauljamesog.blogspot.com/

Adventures in Jimland is a fast paced, not very serious set of rules
for hunting in deepest Darkest Africa and primarily uses a card
system to generate encounters. Gamers take the role of Explorers
who can be supported by a number of soldiers, Askikirs and Beraers
(depending on how much money you have).

http://nagssociety.com/resources/Jimland/Jimland.htm

Use them as is, or with only a slight tweak, they could work well in the
Land that Time Forgot. Either way, the "Reports from Jimland" are an
amusing read. Oh yes, and its free!