Right now I'm MNK42, and I've been neglecting my only gathering class (BTN22), and wanted to get some Earth Crystals to work on my LTW. Long story short, are there any earth elemental enemies in the 30's to mid 40's range that can drop Earth Crystals?

I've wandered most of the world and have seen elementals of all five other types, but no earth elementals in that level range. Northern Thanalan has lv 49s, but I don't think I can reliably take those yet.

I probably could just ask others for a few, or start leveling up BTN a bit, but am I missing some place or are there actually no such creatures?