EDIT: Thanks to Crushric for giving me the elephant idea, I am proud to tell you that it is possible to geomerge an elephant. But it is not stable, it
will move around, but it is still fun to watch and to me is definitely something new.
Btw, this thread used to be in the forge map section, so the format of my words and pictures looks like its advertising a map. I can change it if people need me to, to make the thread easier to understand and to get the point across faster.
Download Pre-DLC Geo
EDIT: I have updated the map, I thought it was worth it since it only has 1 download anyways. Now with objects already in place for you to geomerge the elephant yourself.

Both within 5 seconds of each other showing exactly how much this thing can move around.

The best shot I manged to get of the elephant being unstable/geomerged, I think it lasted about 5 or so seconds before it popped out onto solid ground.

A little thing, I found out. You can still flip an elephant even if its in the ground and you're really far away from it.

Eventually it popped out, but even then it was still a bit geomerged. (WAIT, correct me if I'm wrong, maybe sand is allowed to cover up the treads.)
END OF NEW THINGS
Old Map Description: This may be old, I don't know, but I just wanted to show you guys this. I had discovered this quite a while back, around April. But when I was browsing through Forgehub, I forgot whether it was the forge discussion or the customer service, but I remember there was a question about if geomerging was possible on Pre-DLC, and the majority of the answers, was no. So now I just wanna show this to possibly spark ideas into people's minds or to just show that Pre-DLC isn't un-forgeable.
Disclaimer: On the geomerged crate I had learned how to geo-merge in this
thread. I wanted to see if it was possible to geo-merge something less "stable" or big as a container on Last Resort.

A geomerged box, contained with teleporters.

A geomerged barrier, a small section geomerged, but still something.

The back side of the geomerged barrier. As you can see the teleporters, I used them for keeping hold of the barrier
incase it started moving.
Random uses of the geo-merged objects.