Before 1932 they were further subdivided into four orders based on the imperfectly known larval development and formation of the shell around the pedicle opening.
The overall section can be also subdivided into three orders of fining-upward cycles.
In this work, the Late Cretaceous tectonic Megasequence (AP.9) is subdivided into two second-order sequences from the oldest to the youngest (Cr. A and Cr. B).
As a first step, each alternator is modelled and linearized around an operating point and then it is subdivided into two lower order systems according to the singular perturbation theory.
According to the traditional classification, the class Ascidiacea is subdivided into three major orders: Phlebobranchia, Aplousobranchia, and Stolidobranchia.
In July 1997, at the World Cup Technical Meeting for para-Alpine skiing, this classes was subdivided into two classes in order to improve factoring for the range of disabilities found within the class at the time.
The studied second-order supersequences are subdivided into three third-order depositional sequences that start from the Late Campanian to the Late Maastrichtian and are characterized by progressive shallowing upwards from deep open marine conditions (more than 800 m) during the Late Campanian to a few metres to subaerial erosions by the Late Maastrichtian.
The Dongying Formation, a second-order sequence, can be subdivided into four third-order sequences (from base to top: SQ1, SQ2, SQ3, and SQ4).
The Wenchang Formation, a second-order sequence, can be subdivided into seven third-order sequences (from base to top: SQ1, SQ2, SQ3, SQ4, SQ5, SQ6, and SQ7).
The Es3, a para-second-order sequence, can be subdivided into three third-order sequences (from base to top: SQ1, SQ2, and SQ3).
