Quadrum

No picture of Quadrum was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Quadrum, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
PolycyclolithaceaePBDB
Diet
"photoautotroph"PBDB, for Haptophyta
Life habit
planktonic, depth=surfacePBDB, for Haptophyta
Motility
passively mobilePBDB, for Haptophyta
Environment
oceanic,oligotrophic,marine,brackishPBDB, for Haptophyta

Time the record covers

At least 41 million years on record.

The record covers at least 89.8 Mya to 48.07 Mya. No occurrence read is dated outside 100.5 Mya to 37.71 Mya.

Early Cretaceous — about 0 of 76 occurrencesLate Cretaceous — about 75 of 76 occurrencesLate CretaceousPaleocene — about 0 of 76 occurrencesEocene — about 1 of 76 occurrencesEocene102–100 Mya — about 0.2 occurrences100–97 Mya — about 0.5 occurrences97–95 Mya — about 0.5 occurrences95–93 Mya — about 10 occurrences93–91 Mya — about 25 occurrences91–89 Mya — about 14 occurrences89–87 Mya — about 4 occurrences87–84 Mya — about 3 occurrences84–82 Mya — about 2 occurrences82–80 Mya — about 2 occurrences80–78 Mya — about 2 occurrences78–76 Mya — about 2 occurrences76–73 Mya — about 2 occurrences73–71 Mya — about 2 occurrences71–69 Mya — about 2 occurrences69–67 Mya — about 2 occurrences67–65 Mya — about 0.9 occurrences50–47 Mya — about 0.1 occurrences47–45 Mya — about 0.2 occurrences45–43 Mya — about 0.2 occurrences43–41 Mya — about 0.2 occurrences41–39 Mya — about 0.2 occurrences39–36 Mya — about 0.1 occurrences89.8 Mya48.07 Mya102 Mya36 Mya

76 occurrences of Quadrum on record, most of them in the Late Cretaceous. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.

When

76 occurrences

These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.

Found in

6 formations

Pedro Luro — 39.71°S, 61.04°WAvezac — 43.67°N, 1.11°WLindi — 10.03°S, 39.64°EMooreville Chalk — 32.92°N, 88.07°WButano — 37.42°N, 122.20°WJagüel — 39.86°S, 67.62°W

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The named rock units Quadrum has been recovered from, largest first. Drawn where the rock is now, not where it formed. 61 occurrences have no formation on record, which is common for older literature.

Quadrum and its relatives

Late Cretaceous

Where Quadrum and its relatives were recorded in the Late Cretaceous.

Found in the same rock

287 taxa

The Paleobiology Database records 62 sites for Quadrum, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.

This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.

Entered from

11 references

Each of the 76 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content0

No picture of Quadrum was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Quadrum, or no answer at all. This entry cannot say which.

No 3D scan of Quadrum was found in MorphoSource and Sketchfab.

Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itPolycyclolithaceae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Prins and Perch-Nielsen 1977