Tag: State Route 15 Bikeway

San Diego Natural History Museum paleontologist Rodney Hubscher holds a bed of mussels and a scallop shell taken from the hillside along state Route 15 north of Adams Avenue, March 15, 2016. | Photo Credit: Megan Burks, KPBS By Megan Burks A small whale bone sticking out from a sandstone bluff alerted Caltrans crews working…