Bristolia

Bristolia is an extinct genus of trilobite, fossil marine arthropods, with eight or more small to average size species. It is common in and limited to the Lower Cambrian shelf deposits across the southwestern US, which constitutes part of the former paleocontinent of Laurentia.

Bristolia

Dwergenpaartje · CC BY-SA 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
BristoliinaePBDB
Diet
deposit feederPBDB, for Redlichiida
Life habit
low-level epifaunalPBDB, for Redlichiida
Motility
fast-movingPBDB, for Redlichiida
Environment
marinePBDB, for Trilobita

Time the record covers

At most 5.6 million years on record.

Every occurrence read is dated to somewhere between 515.3 Mya and 509.7 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Cambrian — about 64 of 64 occurrencesCambrian515–515 Mya — about 2 occurrences515–515 Mya — about 3 occurrences515–515 Mya — about 3 occurrences515–514 Mya — about 3 occurrences514–514 Mya — about 3 occurrences514–514 Mya — about 3 occurrences514–514 Mya — about 3 occurrences514–514 Mya — about 3 occurrences514–513 Mya — about 3 occurrences513–513 Mya — about 3 occurrences513–513 Mya — about 3 occurrences513–513 Mya — about 3 occurrences513–513 Mya — about 3 occurrences513–512 Mya — about 3 occurrences512–512 Mya — about 3 occurrences512–512 Mya — about 3 occurrences512–512 Mya — about 3 occurrences512–511 Mya — about 3 occurrences511–511 Mya — about 3 occurrences511–511 Mya — about 3 occurrences511–511 Mya — about 3 occurrences511–511 Mya — about 3 occurrences511–510 Mya — about 3 occurrences510–510 Mya — about 3 occurrences510–510 Mya — about 3 occurrences510–510 Mya — about 2 occurrences515.8 Mya509.2 Mya

64 occurrences of Bristolia on record, most of them in the Cambrian. 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

64 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

Carrara — 35.85°N, 116.23°WCarrara — 37.45°N, 115.73°WCarrara — 36.67°N, 116.32°WCarrara — 36.75°N, 117.07°WCarrara — 36.48°N, 116.73°WCarrara — 36.47°N, 116.75°WCarrara — 36.20°N, 116.35°WCarrara — 36.08°N, 116.23°WCarrara — 35.89°N, 116.08°WLatham — 34.54°N, 115.48°WLatham — 34.59°N, 115.52°WLatham — 34.95°N, 115.58°WLatham — 35.00°N, 115.53°WMule Spring Limestone — 37.32°N, 117.77°WBuelna — 29.28°N, 110.58°WForteau — 50.97°N, 56.44°WSekwi — 63.58°N, 129.20°W

Loading coastlines…

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

Bristolia and its relatives

Cambrian

Where Bristolia and its relatives were recorded in the Cambrian.

Found in the same rock

31 taxa

The Paleobiology Database records 28 sites for Bristolia, 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 64 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 content1

Picture of Bristolia

Credit
Dwergenpaartje
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan of Bristolia 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.

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 itBristoliinae through timeFormations of the CambrianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Harrington 1956