26. examine the orders of trilobites during the paleozoic era, 542 to 251 million yearse ago. you approach an outcrop containing trilobite fossils and have to determine thoe relative age (time periods) for each layer. note that you may not have all of the periods present. a. what is the relative age for layer b? explain your reasoning. b. what is the relative age for layer a? c. what is the relative age for layer e? d. which two relative dating principles did you apply to work these problems?