If I remember correctly the 'standard' is for class G uncontrolled up to 14,500msl unless otherwise annotated on the chart. I had a very tense CFI initial with the FAA when I stuck to my guns and said that class E started at 1200agl over southern florida, whilst the inspector said that it was 14,500msl. I was convinced that I'd failed for about 20 minutes whilst he went off to clarify. It turned out that there is a small corner of the Jacksonville chart showing that class E did indeed start at 1200agl, and the annotated area was so big that it included the entire Miami sectional!