[digidocs]

In western New Mexico there is an area of airspace surrounded with a thick grey line (see picture below). What kind of airspace is this? I don't recognize this marking. Thanks for the help!

 

[emsvitil]

Maybe it's the other way around......

That area is NOT some sort of airspace.

 

[Draker]

That's blue, not gray, and indicates Class E airspace with floor 1,200ft or greater above surface that laterally abuts class G airspace. This boundary is mostly found out in western US. I believe the area inside that boundary is Class G all the way up to, but not including 14,500 ft.

 

[erich weaver]

Terminal radar service area (TRSA)

 

[SantosDumont]

If you look at Pg. 27 of the VFR Chart Legend it says it's where class E starts at 1200ft AGL.

 

[erich weaver]

Yeah, I guess you guys are right. Sure doesn’t look very blue though, and there are MOAs nearby and other lines that clearly are blue.

 

[BobTurner]

I believe the area inside that boundary is Class G all the way up to, but not including 14,500 ft.

+1. The winner.
Look at the ifr enroute chart, it’s more obvious there. (Shaded brown)