The walls were built of small stone slabs .
The walls were have a slight slope ; as is common with the architecture of Mixco Viejo ( Jilotepeque Viejo ) , the walls were topped with vertical cornices .
The walls were built of small stone slabs and have a slight slope ; as is common with the architecture of Mixco Viejo ( Jilotepeque Viejo ) , the walls were topped with vertical cornices .