The Ladinian is a
stage
Stage or stages may refer to:
Acting
* Stage (theatre), a space for the performance of theatrical productions
* Theatre, a branch of the performing arts, often referred to as "the stage"
* ''The Stage'', a weekly British theatre newspaper
* Sta ...
and
age
Age or AGE may refer to:
Time and its effects
* Age, the amount of time someone or something has been alive or has existed
** East Asian age reckoning, an Asian system of marking age starting at 1
* Ageing or aging, the process of becoming older ...
in the
Middle Triassic
In the geologic timescale, the Middle Triassic is the second of three epochs of the Triassic period or the middle of three series in which the Triassic system is divided in chronostratigraphy. The Middle Triassic spans the time between Ma and ...
series
Series may refer to:
People with the name
* Caroline Series (born 1951), English mathematician, daughter of George Series
* George Series (1920–1995), English physicist
Arts, entertainment, and media
Music
* Series, the ordered sets used in ...
or
epoch
In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.
The moment of epoch is usually decided by ...
. It spans the time between
Ma and ~237 Ma (million years ago). The Ladinian was preceded by the
Anisian
In the geologic timescale, the Anisian is the lower stage or earliest age of the Middle Triassic series or epoch and lasted from million years ago until million years ago. The Anisian Age succeeds the Olenekian Age (part of the Lower Triassic ...
and succeeded by the
Carnian
The Carnian (less commonly, Karnian) is the lowermost stage of the Upper Triassic Series (or earliest age of the Late Triassic Epoch). It lasted from 237 to 227 million years ago (Ma). The Carnian is preceded by the Ladinian and is followed by t ...
(part of the
Upper or Late Triassic).
The Ladinian is coeval with the
Falangian regional stage used in
China
China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
.
Stratigraphic definitions
The Ladinian was established by Austrian geologist
Alexander Bittner in 1892. Its name comes from the
Ladin people
The Ladins are an ethnic group in northern Italy. They are distributed in several valleys, collectively known as Ladinia. These include the valleys of Badia and Gherdëina in South Tyrol, of Fassa in the Trentino, and Livinallongo (also known ...
that live in the
Italian
Italian(s) may refer to:
* Anything of, from, or related to the people of Italy over the centuries
** Italians, an ethnic group or simply a citizen of the Italian Republic or Italian Kingdom
** Italian language, a Romance language
*** Regional Ita ...
Alps
The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, Sw ...
(in the
Dolomites
The Dolomites ( it, Dolomiti ; Ladin: ''Dolomites''; german: Dolomiten ; vec, Dołomiti : fur, Dolomitis), also known as the Dolomite Mountains, Dolomite Alps or Dolomitic Alps, are a mountain range located in northeastern Italy. They form pa ...
, then part of
Austria-Hungary
Austria-Hungary, often referred to as the Austro-Hungarian Empire,, the Dual Monarchy, or Austria, was a constitutional monarchy and great power in Central Europe between 1867 and 1918. It was formed with the Austro-Hungarian Compromise of ...
).
The base of the Ladinian Stage is defined as the place in the stratigraphic record where the
ammonite
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...
species ''
Eoprotrachyceras curionii'' first appears or the first appearance of the conodont ''
Budurovignathus praehungaricus
''Budurovignathus'' is an extinct genus of conodont.
Use in stratigraphy
The Ladinian
The Ladinian is a stage and age in the Middle Triassic series or epoch. It spans the time between Ma and ~237 Ma (million years ago). The Ladinian ...
''. The global reference profile for the base (the
GSSP
A Global Boundary Stratotype Section and Point (GSSP) is an internationally agreed upon reference point on a stratigraphic section which defines the lower boundary of a stage on the geologic time scale. The effort to define GSSPs is conducted ...
) is at an
outcrop
An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth.
Features
Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial ...
in the
river bed
A stream bed or streambed is the bottom of a stream or river (bathymetry) or the physical confine of the normal water flow ( channel). The lateral confines or channel margins are known as the stream banks or river banks, during all but flood ...
of the
Caffaro river at
Bagolino
Bagolino ( Brescian: ) is a ''comune'' in the province of Brescia, in Lombardy, Italy, in the valley of the river Caffaro, on the right side of Valle Sabbia. Bagolino is known for the cheese named Bagòss and the carnival. Similar to grana pada ...
, in the
province of Brescia
The Province of Brescia ( it, provincia di Brescia; Brescian: ) is a Province in the Lombardy administrative region of northern Italy. It has a population of some 1,265,964 (as of January 2019) and its capital is the city of Brescia.
With an ar ...
, northern
Italy
Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
.
[The GSSP was established by Brack ''et al.'' (2005)] The top of the Ladinian (the base of the Carnian) is at the first appearance of ammonite species ''
Daxatina canadensis
''Daxatina'' is a fossil ammonoid cephalopod included in the trachyceratid family of the order Ceratitida that lived during the middle of the Triassic.
Distribution
Triassic of Canada, Italy, Svalbard, Jan Mayen and Alaska
References
;Notes ...
''.
The Ladinian is sometimes subdivided into two subages or substages, the Fassanian (early or lower) and the Longobardian (late or upper). The Ladinian contains four ammonite biozones, which are evenly distributed among the two substages:
*zone of ''
Frechites regoledanus''
*zone of ''
Protrachyceras archelaus''
*zone of ''Protrachyceras gredleri''
*zone of ''Eoprotrachyceras curionii''
Ladinian life
References
Notes
Literature
*; 2005: ''The Global boundary Stratotype Section and Point (GSSP) of the Ladinian Stage (Middle Triassic) at Bagolino (Southern Alps, Northern Italy) and its implications for the Triassic time scale'', Episodes 28(4), pp. 233–244.
*; 2004: ''A Geologic Time Scale 2004'',
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by Henry VIII of England, King Henry VIII in 1534, it is the oldest university press
A university press is an academic publishing hou ...
.
External links
GeoWhen Database - LadinianUpper Triassican
Lower Triassictimescales, at the website of the subcommission for stratigraphic information of the ICS
*Norges Network of offshore records of geology and stratigraphy: ''Stratigraphic charts for the Triassic''
an
{{Authority control
Ladinian,
*02
Geological ages
Triassic geochronology