Red Slipper Coral Fossil,Bryozoan Fossil, Double-Valve Twisted Shell Fossil This fossil displays a symbiotic relationship between the red slipper coral, bryozoans, and the double-valve twisted shell, dating back to the **Cretaceous period** (approximately 140 million to 65 million years ago). These species provide valuable insights into the marine ecosystem of that time, highlighting the complex interrelations and ecological interactions among marine life. The fossil was discovered in China, revealing the region's rich biodiversity and unique marine environment.