Guess he just put the pole of the standard on a terradon's base... simple but effective!

Looks really cool indeed...
Another idea would be to cut of the lower part of a saurus standard an put it on a base... put some sand around it to hide the gaps and paint and base as desired... finished is a marker for a saurus unit...
The head piece for the guards alpha and the top pieces of their standards can make some nice markers, too... as would their standards...
If you don't want the pieces to be lying on the ground just get some toothpicks to build a rack or glue them to small stones like they were craft in rocks...
Hope I could help you...
Also don't forget to check the painting and conversion forum! ...the place is bursting with talent and ideas!
