Kau))) on Nostr: npub1e5c0v…cnflr Ah! So it has to do with the fact that the subsurface-dwelling ...
npub1e5c0v7erhy6jj9xhxsjauelzn8euks7x0qhkdxx6ynk6juacldws9cnflr (npub1e5c…nflr) Ah! So it has to do with the fact that the subsurface-dwelling planktic foraminifera are living in "older", deeper waters (~500 m), as opposed to the others which are living in upper waters at the surface (0-50 m). While making shells, the surface bugs readily equilibrate with atmospheric radiocarbon (and hence gives accurate dates). The scientists are looking at dating sediment cores taken from the bottom of the ocean, which contain shells deposited from above; but plankton that lived in 0-50 m and >300 m (and even those living at the ocean bottom), all "co-occur" in the sediments (or mud/clay) that is brought in by rivers or wind. This is why its important to only date shells of surface-ocean species of plankton from marine sediment cores as opposed to the deeper-dwelling ones (w nice experiment borne out in that article).
If two types of plankton were living in the same waters, their source of carbon is the same, and hence their shells will not give different ages.
Sorry to be long, but hopefully simple!
Published at
2023-09-06 22:42:30Event JSON
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"content": "nostr:npub1e5c0v7erhy6jj9xhxsjauelzn8euks7x0qhkdxx6ynk6juacldws9cnflr Ah! So it has to do with the fact that the subsurface-dwelling planktic foraminifera are living in \"older\", deeper waters (~500 m), as opposed to the others which are living in upper waters at the surface (0-50 m). While making shells, the surface bugs readily equilibrate with atmospheric radiocarbon (and hence gives accurate dates). The scientists are looking at dating sediment cores taken from the bottom of the ocean, which contain shells deposited from above; but plankton that lived in 0-50 m and \u003e300 m (and even those living at the ocean bottom), all \"co-occur\" in the sediments (or mud/clay) that is brought in by rivers or wind. This is why its important to only date shells of surface-ocean species of plankton from marine sediment cores as opposed to the deeper-dwelling ones (w nice experiment borne out in that article). \n\nIf two types of plankton were living in the same waters, their source of carbon is the same, and hence their shells will not give different ages.\n\nSorry to be long, but hopefully simple!",
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