Actually the dino is from HLBS's 28mm dino line, which they discontinued earlier this year. When I heard they were stopping all 28mm, I scrounged some money together and bought a bunch of their dinosaurs, and the largest of them was this Styracosaurus.
The head is pewter, and the body & tail are resin - this makes the poor critter so nose-heavy the base was needed to keep it from constant faceplants.
All the HLBS dinos were/are very nice - apparently someone (Copplestone?) has bought the molds and masters, so hopefully they'll be available again sometime!
The cavemen and explorers are all Pulp Figures.