I just found this going through the Archivo General de la Nacion index. There was a discussion last week about finding out who were the escribanos and how they worked. I am pretty sure that each escribano was given a jurisdiccion where he was responsible, so this confirms that in the early 1700s there was an escribano assigned to Jerez y el Valle de Tlaltenango, which at that time, I believe was considered a single municipal entity, split in half by Colotlan which was under a military government under the direct jurisdiccion of the Viceroy of New Spain, i.e. not Nueva Galicia: