layered southwestern salad

Ingredients

• 1/3 cup chopped fresh cilantro
• 1/3 cup fresh lime juice
• 1/2 cup olive oil
• 1/2 cup sour cream
• 1 teaspoon sugar
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• 1 package 16-oz. pkg. romaine lettuce, shredded
• 5 - plum (roma) tomatoes, chopped
• 1 can 15-oz. can black beans, rinsed and drained
• 1 small red onion, chopped
• 1 package 8-oz. pkg. shredded mexican 4-cheese blend
• 1 can 15-oz. can whole kernel corn with red and green peppers, drained (mexi-corn)
• 1 can 6-oz. can sliced ripe olives, drained
• 2 cups crushed tortilla chips
• - garnish: fresh cilantro leaves