Tipped and Untipped Wound Track (image) Arizona State University Caption The tipped spears did not penetrate deeper than the untipped spears, but they did create larger and wider inner wound cavities. Credit Jayne Wilkins, Ben Schoville, Kyle Brown. Usage Restrictions Must be used to illustrate coverage of this research only. 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.