Rhuddanian

443.8 ± 1.5 – 440.8 ± 1.2 Ma

PreꞒ

Ꞓ

↓

Chronology

−444 —

–

−442 —

–

−440 —

–

−438 —

–

−436 —

–

−434 —

–

−432 —

–

−430 —

–

−428 —

–

−426 —

–

−424 —

–

−422 —

–

−420 —

–

−418 —

Age

Stratigraphic unit

Stage

Time span formality

Formal

Lower boundary definition

FAD of the graptolite Akidograptus ascensus

Lower boundary GSSP

Dob's Linn, Moffat, U.K.
55°26′24″N 3°16′12″W / 55.4400°N 3.2700°W

Lower GSSP ratified

1984^[4]^[5]

Upper boundary definition

FAD of the graptolite Monograptus austerus sequens

Upper boundary GSSP

Trefawr Track Section, Llandovery, Wales, U.K.
52°01′48″N 3°42′00″W / 52.0300°N 3.7000°W

Upper GSSP ratified

1984^[5]

In the

Ma and ended 440.8 ± 1.2 Ma (million years ago). It succeeds the Himantian Age (the last age of the Ordovician Period) and precedes the Aeronian Age.^[7]

GSSP

The GSSP for the Silurian is located in a section at Dob's Linn, Scotland, in an artificial excavation created just north of the Linn Branch Stream. Two lithological units (formations) occur near the boundary.^[6] The lower is the Hartfell Shale (48 metres (157 ft) thick), consisting chiefly of pale gray mudstone with subordinate black shales and several interbedded meta-bentonites.^[6] Above this is the 43 metres (141 ft) thick Birkhill Shale, which consist predominantly of black graptolitic shale with subordinate gray mudstones and meta-bentonites.^[8]

References

doi:10.1017/S0263593300000377
.

doi:10.1016/S0031-0182(03)00304-3
.

^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.

doi:10.3389/feart.2018.00191
.

^
doi:10.18814/epiiugs/1985/v8i2/005
. Retrieved 11 December 2020.

^
ISBN 9780521786737
.

^ "GSSP Table - All Periods". International Commission on Stratigraphy. Retrieved 15 September 2018.

^ "GSSP for the Rhuddanian Stage". International Commission on Stratigraphy.

v
t
e
Geological history of Earth
Cenozoic Era
(present–66.0 Ma)
Quaternary (present–2.58 Ma)

Holocene (present–11.8 ka)

Pleistocene (11.8 ka–2.58 Ma)

Neogene (2.58–23.0 Ma)

Pliocene (2.59–5.33 Ma)

Miocene (5.33–23.0 Ma)

Paleogene (23.0–66.0 Ma)

Oligocene (23.0–33.9 Ma)

Eocene (33.9–56.0 Ma)

Paleocene (56.0–66.0 Ma)

Mesozoic Era
(66.0–252 Ma)
Cretaceous (66.0–145 Ma)

Late (66.0–100 Ma)

Early (100–145 Ma)

Jurassic (145–201 Ma)

Late (145–164 Ma)

Middle (164–174 Ma)

Early (174–201 Ma)

Triassic (201–252 Ma)

Late (201–237 Ma)

Middle (237–247 Ma)

Early (247–252 Ma)

Paleozoic Era
(252–539 Ma)
Permian (252–299 Ma)

Lopingian (252–260 Ma)

Guadalupian (260–272 Ma)

Cisuralian (272–299 Ma)

Carboniferous (299–359 Ma)

Pennsylvanian (299–323 Ma)

Mississippian (323–359 Ma)

Devonian (359–419 Ma)

Silurian (419–444 Ma)

Pridoli (419–423 Ma)

Ludlow (423–427 Ma)

Wenlock (427–433 Ma)

Llandovery (433–444 Ma)

Ordovician (444–485 Ma)

Cambrian (485–539 Ma)

Furongian (485–497 Ma)

Miaolingian (497–509 Ma)

Series 2 (509–521 Ma)

Terreneuvian (521–539 Ma)

Proterozoic Eon
(539 Ma–2.5 Ga)
Neoproterozoic (539 Ma–1 Ga)

Ediacaran (539–635 Ma)

Cryogenian (635–720 Ma)

Tonian (720 Ma–1 Ga)

Mesoproterozoic (1–1.6 Ga)

Stenian (1–1.2 Ga)

Ectasian (1.2–1.4 Ga)

Calymmian (1.4–1.6 Ga)

Paleoproterozoic (1.6–2.5 Ga)

Statherian (1.6–1.8 Ga)

Orosirian (1.8–2.05 Ga)

Rhyacian (2.05–2.3 Ga)

Siderian (2.3–2.5 Ga)

Archean Eon (2.5–4 Ga)

Neoarchean (2.5–2.8 Ga)

Mesoarchean (2.8–3.2 Ga)

Paleoarchean (3.2–3.6 Ga)

Eoarchean (3.6–4 Ga)

Hadean Eon (4–4.6 Ga)

ka = kiloannum (thousands years ago); Ma = megaannum (millions years ago); Ga = gigaannum (billions years ago).
See also: Geologic time scale • Geology portal • World portal

This geochronology article is a stub. You can help Wikipedia by expanding it.
v
t
e

Retrieved from "https://en.wikipedia.org/w/index.php?title=Rhuddanian&oldid=1048419736"

This page is based on the copyrighted Wikipedia article: Rhuddanian. Articles is available under the CC BY-SA 3.0 license; additional terms may apply.Privacy Policy