First appearance datum (FAD) is a term used by geologists and paleontologists to designate the first appearance of a species in the geologic record. FADs...

Masafumi; Danhara, Yugo; Aziz, Fachroel (2020). "Age control of the first appearance datum for Javanese Homo erectus in the Sangiran area". Science. 367 (6474):...

mudstone. The lower boundary of the Sandbian is defined as the first appearance datum of graptolite species Nemagraptus gracilis in that section. Wellman...

by the first appearance datum of the trace fossil Treptichnus pedum around 538.8 million years ago. Its top is defined as the first appearance of trilobites...

Danhara, Yugo; Aziz, Fachroel (10 January 2020). "Age control of the first appearance datum for Javanese Homo erectus in the Sangiran area". Science. 367 (6474):...

lower boundary has to be defined using a primary marker (usually first appearance datum of a fossil species). There should also be secondary markers (other...

49.6829°N 57.9653°W / 49.6829; -57.9653) and corresponds to the first appearance datum (FAD) of the conodont Iapetognathus fluctivagus at the 101.8 m above...

Labrador based upon the appearance of the first assemblage of vertical burrowing animal trace fossils, Treptichnus pedum. The same datum defines the top of...

for the base of the Lawsonian Stage (Cambrian Stage 10) at the First Appearance Datum of Eoconodontus notchpeakensis (Miller) in the House Range, Utah...

periods of time. All GSSPs for the Permian are based around the first appearance datum of specific species of conodont, an enigmatic group of jawless chordates...

is primarily based on the use of ammonites as index fossils. The first appearance datum of specific ammonite taxa is used to mark the beginnings of stages...

abnormal tusk from Lisbon, the Miocene record in Portugal and the first appearance datum. Evidence from Lisbon, Portugal" (PDF). Ciencias da Terra. 15: 173–190...

correlation, and chronostratigraphy—Overcoming deficiencies of the first appearance datum (FAD) concept". Earth-Science Reviews. 123: 133–172. Bibcode:2013ESRv...

the base of the Rhaetian, either at the first occurrence of Misikella hernsteini or the first appearance datum of Misikella posthernsteini (sensu lato)...

formations consist mainly of shale and chert. The base is defined as the first appearance datum of the graptolite species Normalograptus extraordinarius in that...

lower boundary of the Katian. The lower boundary is defined as the first appearance datum of the graptolite species Diplacanthograptus caudatus. This horizon...

chemical compound. Fad Browne (1906–1991), Irish politician Fad diet First appearance datum, the date of the oldest known fossil of a living species Fish aggregating...

Karpinsky in 1874. The base of the Artinskian Stage is defined as the first appearance datum (FAD) of the conodont species Sweetognathus whitei and Mesogondolella...

paleobiological events: the first appearance datum (FAD) of one index taxon and the FAD of another. A first appearance datum is a point in the geological...

shale. The lower boundary of the Darriwilian is defined as the first appearance datum of the graptolite species Undulograptus austrodentatus in that section...

faunachron (LVF) is a time interval that is defined by the first appearance datum (FAD), or first occurrence, of a tetrapod index fossil and is commonly used...

zone is simply the biozone defined by the first (first appearance datum or FAD) and last (last appearance datum or LAD) occurrence of a single taxon. The...

Kyrshabakty River, about 28 km north-east of the Zhanatas town. The first appearance datum (FAD) of Agnostotes orientalis is located at an altitude of 259...

International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum of the Psiloceras spela-group as the defining biological marker...

Canada; Bartyrbay of Kazakhstan; and the Hebei province of China. The first appearance datum (FAD) of Iapetognathus fluctivagus in the cliffs of Green Point...

defining a W. crosbyi zone. Notwithstanding the weakness of a first appearance datum as a definition for the base of a period, the species has been proposed...

bulgy' sense-datum and his consciousness of this sense-datum. When we twist a coin it 'appears' to us as elliptical. This elliptical 'appearance' cannot be...

International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum (FAD) of Monograptus uniformis as the defining biological marker...

International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum of Pachydiscus neubergicus as the defining biological marker for...

the First Appearance Datum of Hindeodus parvus as the defining biological marker for the start of the Induan, 252.2 ± 0.5 million years ago, the first stage...