Paleo and Geo Apps?

[Maniraptora]

Wondering if anyone knows of some good apps for paleontology and geology topics. They can be for reference, identification, whatever— anything other than dinosaur-themed kids’ games the App Store is most interested in showing me, haha. Preferably with some offline capabilities. I already downloaded Rockd and would really be enjoying the offline geological map feature if it wasn’t so glitchy in choosing to load properly or not, so if anyone’s gotten that to work more reliably, please share your secret.  Thanks for the input!