I once coached in a league that had 4 fields at the same site, 3 of the 4 had dirt infields. The league had 9-10 and 11-12 divisions. Around these parts I have to say that these fields were the exception, more typically infields are dirt most everywhere.
Dirt circle is about 13' in ML size fields. Since 60 bases are about 2/3 the size of ML fields the dirt circle should be about 9', and where there is no grass, as an umpire we should be able to judge when a batter has given up without the need for a circle.
But again, it should only apply in leagues where runners can lead off bases, typically not done on 60' bases.
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