Prepare Baking Sheet: Line a baking sheet with a silicone baking mat, parchment paper, or wax paper.
Melt Chocolate: Roughly chop the chocolate almond bark to speed up melting. Place it in a microwave-safe glass bowl. Microwave on 50% power for 3 minutes, stirring midway, then microwave for an additional 1-2 minutes, or until melted, stirring every 30 seconds if needed. Reserve about 1/4 cup of melted chocolate for drizzling.
Melt Caramel: Place caramel squares in another microwave-safe bowl with 1-2 tbsp of water or heavy cream. Microwave on 50% power for 1 minute, stir, then microwave for another minute, adding additional time in 30-second intervals until smooth.
Form the Bark: Pour the melted chocolate onto the prepared baking sheet, smoothing it out with a spatula. Drop spoonfuls of melted caramel across the chocolate, then use a butter knife to swirl the caramel and chocolate together for a marbled effect.
Add Pecans: Sprinkle the whole and chopped pecans over the top, pressing lightly if necessary. Drizzle the reserved chocolate over the entire mixture for a finished look.
Set and Serve: Let the bark harden at room temperature for 2-3 hours. Once completely set, cut or break into pieces. Store in an airtight container.