Accessing Non-CustomPlayable Clips like Activation, Animation etc

So I'm making a system that copies over clips of each type and duplicates them on new timelines. I haven't found a way to duplciate them without targeting the specific type of clip, which has worked fine for all my custom playable clip types, but I'm running into a big snag with the standard types (ActivationClip, AnimationClip, AudioClip, etc)

Here's how I'm copying my custom playable types:

Code (CSharp):

1.  case "CAM_ShakeTrack":
2.                 newClip = targetTrack.CreateClip<CAM_ShakeClip>();
3.  
4.                 CAM_ShakeClip csclip = newClip.asset as CAM_ShakeClip;
5.                 CAM_ShakeClip csoldClip = copyClip.asset as CAM_ShakeClip;
6.  
7.                 csclip.template.CamShakeTarget = csoldClip.template.CamShakeTarget;
8.                 csclip.template.ShakeAmount = csoldClip.template.ShakeAmount;
9.                 csclip.template.ShakeDuration = csoldClip.template.ShakeDuration;
10.                 csclip.template.Smooth = csoldClip.template.Smooth;
11.                 csclip.template.SmoothAmount = csoldClip.template.SmoothAmount;
12.                 csclip.template.played = csoldClip.template.played;
13.  
14.                 newClip.start = targetClip.start + timeOffset;
15.                 newClip.duration = copyClip.duration;
16.                 return;

but when I try the same type of code of type AnimationClip I get a missingly assembly reference error.

Code (CSharp):

1. Assets/Scr_TimelineUpdateManager.cs(570,17): error CS0246: The type or namespace name `ActivationClip' could not be found. Are you missing an assembly reference?

Investigating, I found that the tracks of AnimationTrack type debug their types as UnityEngine.Timelime.AnimationTrack instead of just AnimationTrack, so I tried targeting the clips as UnityEngine.Timelime.AnimationClip type, but still no dice.

This attempt:

Code (CSharp):

1.  case "UnityEngine.Timeline.ActivationTrack":
2.  
3.                 newClip = targetTrack.CreateDefaultClip();
4.  
5.               // niether of these working
6.               //  ActivationClip acClip = newClip.asset as ActivationClip;
7.               //  ActivationClip acOldClip = copyClip.asset as ActivationClip;
8.               UnityEngine.Timeline.ActivationClip acClip = newClip.asset as UnityEngine.Timeline.ActivationClip;
9.               UnityEngine.Timeline.ActivationClip acOldClip = copyClip.asset as UnityEngine.Timeline.ActivationClip;
10.              
11.                 newClip.start = targetClip.start + timeOffset;
12.                 newClip.duration = copyClip.duration;
13.  
14.                 //+ access other things within clip
15.  
16.                 return;

returns this error:

Code (CSharp):

1. Assets/Scr_TimelineUpdateManager.cs(586,38): error CS0234: The type or namespace name `ActivationClip' does not exist in the namespace `UnityEngine.Timeline'. Are you missing an assembly reference?

Am I really just missing a different assembly reference of is there a different way needed to target these clip types?

Thanks!