With any mana base, you need to
balance speed (coming into play untapped) with color-fixing (having the proper mix of mana colors available to yourself). Factor your mana ramp (spells and mana rocks) into this.
Evolving Wilds and
Terramorphic Expanse are fine if that is all the color fixing you have available. I like the Panoramas a little better for three-color decks, as they make mana on their own and still let you color fix.
Upon reviewing your mana base:
First, keep in mind that
Glacial Chasm and
Maze of Ith do not produce mana. So you are effectively only running 33 lands. I like more than that in a tri-color deck. I would suggest trying to put in a couple more mana producing lands. To make room, I would suggest cutting
Glacial Chasm and
Maze of Ith. Dinos are a fairly expensive (CMC) tribe to support. You do not want to be wasting land drops on lands that don't make mana. (
Glacial Chasm even costs you a land. It counts as -1 land.)
I would keep the battle lands, check lands, and
shock lands.
Drop the bicycle lands, scry lands and tri-land. You want speed in your mana base since you're playing aggro.
After that, evaluate each land that doesn't produce colored mana and determine if you actually NEED it (rather than want it) for your gameplan. And this should be a need not being met by the spells in your deck. For instance, Slayer's Stronghold ... you have other things that can grant haste. And is
vigilance on a single creature really going to be worth not having useful color. Ask yourself that question with each card. Keep colorless lands to an absolute minimum.
Fill in the rest of the lands with basics. A roughly even mix, but skew slightly toward
Forest, as your mana ramp spells are all green.
Speaking of ... The mana ramp is where you can accomplish a lot of mana fixing.
Cultivate and
Rampant Growth - type spells can let you get the colors you are missing. On that topic, I'm not a fan of
Reap and Sow. It's 4 mana and only gets you one land. You get to blow one up if you're willing to spend 6 mana
I would replace with
Kodama's Reach.
Then you need a few mana rocks that can tap for mana of any color. I'm not a fan of
Nature's Lore. It helps you ramp, but not fix, as it is green and only lets you grab a
Forest. I would replace with
Birds of Paradise. I would also try to put in another mana rock like
Fellwar Stone,
Commander's Sphere,
Darksteel Ingot. Again, something to color fix. For this slot, I would probably cut
Commune with Dinosaurs. You have Commune listed in the ramp slot, it doesn't really ramp, since it puts the card in your hand; it just helps smooth your land drops. Commune with Dinos is also not a very good tutor when you only have 22 dinos in your deck.
Hope this helps.
Happy Brewing!