Clarification on the SEA-TAC VFR map I've been looking at the SEA-TAC VFR map, and something caught my eye...

On this map one can see that the SEA-TAC airport has a class B designation in a strange inverse-rhomboid  shape, surrounded by, depending on the direction, class C or D airspace.
This is confusing to me, and I am looking for clarification.
Specifically:
There is no Ceiling or floor stated for the class C space. What are the proper ceiling/floor elevations for the class C airspace?
There is also no ceiling or floor for the class D space. What are the proper ceiling/floor elevations here?
The center of the map also says &quot;see NOTAMSs/SUPPLEMENT&quot; for class D eff hrs. I didn't get any supplement with this digital map.. where would I find this information?
Your question is flawed because you have labeled the airspace incorrectly:

The thin circular magenta line you have labeled class C is actually the edge of the 30 mile mode C veil around SEA.

The shaded magenta line you have labeled class D actually depicts the area where the class E floor is 700’ AGL.


If you want to see how class C airspace is normally depicted, look North to NAS Whidbey Island.
If you want to see how class D airspace is depicted, come halfway back to Paine Field in Everett.  (There is also class D around SEA, BFI and RNT, but they overlap each other and the chart is pretty busy in this area, so Everett is a cleaner example.)