Shastoceras

Shastoceras is a genus of extinct ammonites found in Lower Aptian sediments in Northern California. Although sometimes placed in the Heteroceratidae, a family characterized by a helically wound early portion, its form indicates it more likely belongs to the Ancyloceratidae.

Shastoceras

Apokryltaros at English Wikipedia · CC BY 3.0 · via Wikipedia/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.

On record

Recorded, not inferred
Sits inside
AncyloceratidaePBDB
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 least 1.8 million years on record.

The record covers at least 121.4 Mya to 119.57 Mya. No occurrence read is dated outside 125.77 Mya to 113.2 Mya.

Early Cretaceous — about 5 of 5 occurrencesEarly Cretaceous126–125 Mya — about 0.1 occurrences125–125 Mya — about 0.1 occurrences125–124 Mya — about 0.1 occurrences124–124 Mya — about 0.1 occurrences124–124 Mya — about 0.1 occurrences124–123 Mya — about 0.1 occurrences123–123 Mya — about 0.1 occurrences123–122 Mya — about 0.1 occurrences122–122 Mya — about 0.1 occurrences122–121 Mya — about 0.1 occurrences120–119 Mya — about 0.1 occurrences119–119 Mya — about 0.3 occurrences119–119 Mya — about 0.3 occurrences119–118 Mya — about 0.3 occurrences118–118 Mya — about 0.3 occurrences118–117 Mya — about 0.3 occurrences117–117 Mya — about 0.3 occurrences117–116 Mya — about 0.3 occurrences116–116 Mya — about 0.3 occurrences116–115 Mya — about 0.3 occurrences115–115 Mya — about 0.3 occurrences115–115 Mya — about 0.3 occurrences115–114 Mya — about 0.3 occurrences114–114 Mya — about 0.3 occurrences114–113 Mya — about 0.3 occurrences121.4 Mya119.57 Mya126.3 Mya112.7 Mya

5 occurrences of Shastoceras 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

5 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

1 formation

Budden Canyon — 40.45°N, 122.58°WBudden Canyon — 40.42°N, 122.65°WBudden Canyon — 40.43°N, 122.65°W

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The named rock units Shastoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Shastoceras and its relatives

Early Cretaceous

Where Shastoceras and its relatives were recorded in the Early Cretaceous.

Found in the same rock

13 taxa

The Paleobiology Database records 5 sites for Shastoceras, and this reads all of them. The number is how many of those sites it was catalogued from too.

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

3 references

Each of the 5 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. Each entry links to doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content2

Picture of Shastoceras

Credit
Apokryltaros at English Wikipedia
Licence
CC BY 3.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution-NonCommercial
Commercial use
the licence does not allow it

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 itAncyloceratidae through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Anderson 1938