Datapoint Gullah/ɔ - lower mid back rounded vowel
Turner ([1949] 2002: 18) writes that "[ɔ] is seldom heard in Gullah". This is correct if we mean by [ɔ] the aw sound in RP law. However, this vowel clearly exists as the lax (lower), back, round, mid vowel known from West African languages (see Jones-Jackson 1978: 103).
Values 
Exists (as a major allophone)
- Example 13-264:
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kɔnəcorner