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North American Paleontological Conferience (NAPC) field trip toCrystal Cove State Park, Laguna Beach, Orange Co., CA, June 25, 2019

Aplysia californica (California sea hare)	a sipunculan (annelid peanut worm), Themiste pyroides	-
-	Pachygrapsus crassipes (lined shorecrab)	a bryozoan, Membranipora membranacea, on a brown alga
-	-	sunburst anemone (Anthopleura sola)
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-	Pachygrapsus crassipes (lined shorecrab)	-
-	-	Pleistocene fossils from the last interglacial episode (about 120,000 years before present). Note that these have fallen down from the top of the cliff where they are found immediately above much older rocks (about 6+ million years old) of the Monterey Formation. The gap (unconformity) is due to the previous erosion of the rocks of younger age known as the Capistrano Formation where it is still present elsewhere.
-	According to the park's document, Geological Points of Interest (see #8 in linked source), these flying saucer-like rocks are concretions that formed inside the Monterey Formation, something analogous to the response your body experiences when you have a splinter. In this case, sunken wood lands on mile-deep layers of marine silt and the skeletons of plankton such as diatoms. Later, the wood swells up with bacteria to form an ooze, which eventually turns to stone. - Source	-
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Return to Other field trips to Crystal Cove or Biology 317 Fieldtrip Map or Bio 317 Field Marine Biology Home Page