Berriasella jacobi

Berriasella jacobi is an extinct species of ammonite from the late Jurassic and early Cretaceous. Because of its unique stratigraphic position, it is used as an index fossil to determine the boundary of the Cretaceous and Jurassic periods. The Berriasella jacobi zone defines the substage of the Lower Berriasian, the Berriasian being the lowest stage of the Cretaceous. However, due to the species limited geographic distribution, several other candidates have also been nominated, including Calpionella alpina.

No picture of Berriasella jacobi 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 Berriasella jacobi, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
BerriasellaPBDB
Diet
carnivorePBDB, for Ammonoidea
Life habit
nektonicPBDB, for Ammonoidea
Motility
fast-movingPBDB, for Ammonoidea
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At most 8.1 million years on record.

Every occurrence read is dated to somewhere between 145.06 Mya and 137.05 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Late Jurassic — about 2 of 16 occurrencesLate JurassicEarly Cretaceous — about 14 of 16 occurrencesEarly Cretaceous145–145 Mya — about 0.1 occurrences145–145 Mya — about 0.3 occurrences145–144 Mya — about 0.3 occurrences144–144 Mya — about 0.3 occurrences144–144 Mya — about 0.3 occurrences144–143 Mya — about 0.3 occurrences143–143 Mya — about 0.3 occurrences143–143 Mya — about 2 occurrences143–143 Mya — about 2 occurrences143–142 Mya — about 2 occurrences142–142 Mya — about 2 occurrences142–142 Mya — about 2 occurrences142–141 Mya — about 2 occurrences141–141 Mya — about 2 occurrences141–141 Mya — about 0.4 occurrences141–140 Mya — about 0.1 occurrences140–140 Mya — about 0.1 occurrences140–140 Mya — about 0.1 occurrences140–140 Mya — about 0.1 occurrences140–139 Mya — about 0.1 occurrences139–139 Mya — about 0.1 occurrences139–139 Mya — about 0.1 occurrences139–138 Mya — about 0.1 occurrences138–138 Mya — about 0.1 occurrences138–138 Mya — about 0.1 occurrences138–137 Mya — about 0.1 occurrences137–137 Mya — about 0.1 occurrences137–137 Mya — about 0.0 occurrences145.6 Mya136.6 Mya

16 occurrences of Berriasella jacobi on record, most of them in the Early 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

16 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

4 formations

Stramberk — 49.58°N, 18.11°ELo Valdés — 33.75°S, 70.03°WLo Valdés — 34.27°S, 69.93°WChigan — 43.03°N, 132.32°EChia Gara — 37.01°N, 43.40°E

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The named rock units Berriasella jacobi has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Berriasella jacobi and its relatives

Early Cretaceous

Where Berriasella jacobi and its relatives were recorded in the Early Cretaceous.

Found in the same rock

30 taxa

The Paleobiology Database records 14 sites for Berriasella jacobi, 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

6 references

Each of the 16 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 Berriasella jacobi 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 Berriasella jacobi, or no answer at all. This entry cannot say which.

No 3D scan of Berriasella jacobi was found in Sketchfab.

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

The description on this site

Licence
CC BY-SA 4.0

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

Keep going

What may have been alongside itBerriasella through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Mazenot 1939