Class G airspace — surface up to but not including 1,200 feet AGL; Class E airspace — 1,200 feet AGL up to but not including 18,000 feet MSL.

As shown in the attached figure, Bryn Airport (a private airport) is located within a Military Operating Area and near a Restricted Area (see the larger figure from the question). The absence of other airspace markings indicates that Bryn is surrounded by Class G airspace, which is common for many private airports. Additionally, we know that in the US, Class E airspace begins at 1,200 feet AGL (not depicted). Therefore, in this case, the airspace is Class G from the surface to 1,199 feet AGL and then Class E from 1,200 feet AGL up to the next underlying airspace, Class A, at 18,000 feet MSL. For more details, refer to the “Class E: Definitions” and “Class G” videos.