In a medium bowl, mash the avocados. Mix in lime juice, cilantro, salsa, garlic salt and pepper.
In a small bowl, blend the sour cream and taco seasoning.
In a 9x13 inch dish or on a large serving platter, spread the refried beans. Top with sour cream mixture. Spread on guacamole. Top with tomatoes, green onions, Mexican-style cheese blend and black olives.
