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The Status column has a "golden spike" for every GSSP which has been formally agreed by the ICS. Those without have only candidate sections which have not yet been formally ratified. The clock stands for times that are currently defined only by an age. The "Defining markers" column lists the evidence in the rock used to define the boundary.
A geologic section has to fulfill a set of criteria to be adapted as a GSSP by the ICS. The following list summarizes the criteria: [2] [3] A GSSP has to define the lower boundary of a geologic stage. The lower boundary has to be defined using a primary marker (usually first appearance datum of a fossil species).
In the geologic time scale, the Greenlandian is the earliest age or lowest stage of the Holocene Epoch or Series, part of the Quaternary. [3] [4] Beginning in 11,650 BP (9701 BCE or 300 HE) and ending with the 8.2-kiloyear event (c. 8200–8300 BP, 6200–6300 BCE, 3600–3700 HE), it is the earliest of three sub-divisions of the Holocene. [5]
Lower boundary GSSP candidate section(s) Duibian, Zhejiang, China: Upper boundary definition: FAD of the Conodont Iapetognathus fluctivagus. Upper boundary GSSP: Greenpoint section, Green Point, Newfoundland, Canada: Upper GSSP ratified: 2000 [2]
Status GCUX GIAC Certified UNIX Security Administrator SEC506 Unobtainable [11] GPPA GIAC Certified Perimeter Protection Analyst Unobtainable. [12] Formerly GCFW (Certified Firewall Analyst) GSSP-JAVA GIAC Secure Software Programmer Java DEV541 Unobtainable [13] GSSP-.NET GIAC Secure Software Programmer .NET DEV544 Unobtainable [14]
In the geological timescale, the Ludlow Epoch (from 427.4 ± 0.5 million years ago to 423.0 ± 2.3 million years ago) occurred during the Silurian Period, after the end of the Homerian Age. It is named for the town of Ludlow in Shropshire, England. The Ludlow Epoch is subdivided into two stages: Gorstian and Ludfordian.
In the geologic timescale, the Artinskian is an age or stage of the Permian.It is a subdivision of the Cisuralian Epoch or Series.The Artinskian likely lasted between 290.1 and 283.3 million years ago (Ma) according to the most recent revision of the International Commission on Stratigraphy (ICS) in 2022. [3]
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