Adventures in Jimland

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!

There is also a Jimland scrapbook here, showing some adventures using 15mm figs
http://www.circagames.com/Resources/IECE_Jimland.html