Interior of cave site PP5-6 (IMAGE) Arizona State University Caption Inside the cave site PP5-6 shows the excavation process. The green tarp at the top of the image is the opening of the cave. Orange flags mark layers of the excavation where artifacts have been found, which are recorded on the yellow total station and then entered into a computer for tracking. Credit SACP4 Usage Restrictions None. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.