Fight continues - you will get to a small enemy camp. As the slade says Slade'a - split up to take your enemies in cross-fire. The dinos should help you too - they will attack as soon as the shooting starts.
Now it's time to get into base. You can use the ladder shown on the above picture, it's a good spot to take out incoming soldiers. Get rid of them all.
Eliminate all resistance and keep going inwards the base. When everybody is dead - enter it through the doors.
Your current task: Check enemy base
Slade will leave you, but he wasn't very useful after all, so it's not a big deal. Let's go.
Theoretically it's possible to get through this part using stealth tactics, but practically it's going to be a open massacre. In a nearby room you can find a mine launcher and, if you want to resupply you arrows - use the ladder.
There is a fogged room and a pack of soldiers behind the doors.
Follow the walkway upstairs. It's the time when hell is going to break loose.
After the fight you will get to the command center. During a cutscene you will find out, that the planet was terraformed and the dinosaurs are the effect of accelerated evolution.
Well - just keep going.
You will find a funny room with lots of elevated walkways flashing and elect discharges. And of course lots of enemy soldiers.
Your current task: Meet with Slade
Slade will inform you about the elevator he has found. It's your way out of the base.
Your current task: Help Slade
Happy reunion. Prepare for the final, tough and long fight during your elevator travel.
And just get out of the base to finish this chapter.