Gooey Turtle Bars

2 cups graham cracker crumbs
1/2 cup butter or margarine, melted
2 cups semisweet chocolate chips
1 cup pecan pieces
1 (12 ounce) jar caramel topping

Combine crumbs and butter or margarine in an ungreased 13 x 9-inch pan; stir and press firmly into bottom of pan. Sprinkle with chocolate chips and pecans. Remove lid from caramel topping; microwave for 1 to 1 1/2 minutes or until hot, stirring after 30 seconds. Drizzle over pecans. Bake at 350 degrees F for 15 minutes or until morsels melt; let cool in pan on a wire rack. Chill at least 30 minutes; cut into bars.