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Early Miocene (17 million years ago)

The oldest Laguna Hills fossils represent a shallow marine fauna similar to life found in the Caribbean today. Pecten Reef Park, west of the Community Center is a limestone deposit with pecten shells (scallops), moon snails, and clams.

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Burrowing Sponges
 
Sea Urchin
 
Scallop
   
Moon Snail
 
Cowry
 
Tiger Shark
    Crocodile
Puffer Fish
 
Shark Teeth
 
Crocodile

Primitive Life

  • Coralline Algal Colonies
  • Burrowing Sponges
  • Serpulid Tube Worm Colonies
  • Bryozoan Colonies

 Echinoderms

  • Button Sand Dollars
  • Sea Urchin Spines

 Mollusks          

  • Crassicardo Scallops
  • Triangular Clams
  • Heart Shaped Cockles
  • Gaper Clams
  • Pismo Clams
  • Titan Oysters
  • Turritella Snails
  • Murex
  • Trophon Snails
  • Moon Snails
  • Cone Shells

Sharks and Rays

  • Bat Rays
  • Tiger Sharks
  • Indian Ocean Sharks
  • Isurus or Bonito Sharks

Tropical reef fish

  • Puffer Fish
  • Trigger Fish  

Reptiles

  • Sea Turtles
  • Coastal Crocodiles

 Birds

  • Praemancalla lagunensis Flightless auk (named for the Laguna Hills)
  • Petrel
  • Albatross
  • Puffinus diatomicus Shearwater  

Marine Mammals

  • Allodesmus Large Sea Lion
  • Mysticeti Baleen Whales 
  • Odontoceti Toothed Whales, Porpoises, and Proto-Dolphins
  •  Primitive Fur Seals
  • Desmostylus Primitive Sea Cow

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