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Middle
to Late Miocene (13 million years ago)
The sinking sea floor created a deep ocean where the Los Angeles
Basin is today. The Laguna Hills sea floor was over a mile below
sea level. Whales, dolphins, lantern fish, and sharks were common
residents.
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Whale
Barnacles
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Great
White Shark
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Sculpin
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Sea
Turtle
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Loon
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Albatross
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Booby
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Dolphins
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Desmostylus
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- Brachiopods
- Mollusks
- Delectopecten pechami
- Anadara trilineata
- Common Arthropods
- Goose Neck Barnacle
- Whale Barnacles
- Sharks and Rays
- Great White Shark
- Bat Rays
- Bonito Shark
- Tiger Shark
- Boney Fish
- California Sheephead
- Sculpin
- Bathylagus Smelt
- Rockfish
- Lampanyctus Lantern Fish
- Smilodonichthys Saber-Toothed Salmon
- Porgy
- Myctophids
- Tuna
- Reptiles
- Birds
- Praemancalla lagunensis (named for Laguna Hills) Flightless
auk
- Osteodontornis Bony "toothed"
- Petrel
- Loon
- Albatross
- Puffinus diatomicus Shearwater
- Booby
- Gannet
- Marine Mammals
- Allodesmus Large Sea Lion
- Mysticeti Baleen Whales
- Odontoceti Toothed Whales, Porpoises, and Proto-Dolphins
- Primitive Fur Seals
- Allodesmus Sea Lions
- Desmostylus
- Paleoparadoxia
- Imagotarian Tuskless Walrus
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