(geology) A very large-scale lithostratigraphic sequence in the rock record that represents a complete cycle of marine transgression and regression on a craton over a geologic time scale.

plural of cratonic sequence

a sequence of DNA, RNA, or amino acids that reflects the most common choice of base or amino acid at each position.

Alternative form of main sequence.

(astronomy) A major grouping of stars represented on a Hertzsprung-Russell diagram by a nearly uniform band of increasing luminosity with increasing surface temperature.

(genetics) The sequence at the 5' end of an mRNA molecule that is not translated into protein.

A suite of rocks containing a variety of separate strata, with an overall lithology that can be used to interpret the paleoenvironment of deposition over a certain period.

A DNA or protein sequence with a high degree of sequence identity to other sequences in that species, or in others.

plural of rock sequence

(genetics) The string of base pairs (adenine, thymine, cytosine, and guanine) which, when arranged in triplets to form codons, create a DNA string which encodes polypeptides.