First appearance datum
id:
first-appearance-datum-197-5334499
title:
First appearance datum
text:
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 are determined by identifying the geologically oldest fossil discovered, to date, of a particular species. A related term is last appearance datum (LAD), the last appearance of a species in the geologic record. FADs are frequently used to designate segments in the geologic time scale. A given FAD can be used to define a Global Boundary Stratoty
brand slug:
wiki
category slug:
encyclopedia
description:
Term to designate the first appearance of a species in the geologic record
original url:
https://en.wikipedia.org/wiki/First_appearance_datum
date created:
date modified:
2024-03-26T10:23:06Z
main entity:
{"identifier":"Q5454123","url":"https://www.wikidata.org/entity/Q5454123"}
image:
fields total:
13
integrity:
14