Genesis A is the name given by scholars to the earlier half of an Old English poetic adaptation of the Biblical book of Genesis, and is also called the Elder Genesis. The poem is fused with what scholars now consider a separate and distinct work, Genesis B, found in the Junius Manuscript, which has been held in the Bodleian Library at the University of Oxford since 1677.
Genesis A begins before Biblical Genesis--not with the creation of the world but with the creation of Heaven and the angels and with Satan's war on Heaven. Then the poet describes the days of creation, culminating with the creation of Adam and a description of the Garden of Eden. After this, the poem scholars call Genesis B resumes the story of Adam in the Garden, while also going back to the war on Heaven Genesis A already discussed.
Scholars consider the poem in the Junius manuscript of separate authorship than Genesis B, though both are presented concurrently in the Junius Manuscript. C.L. Wrenn even considers Genesis A to be a composite work.
Scholars such as Wrenn once considered the work to be partially written by Cædmon, though as far back as Laurence Michel in 1947 there were critics: he calls the attribution based on "circumstantial evidence" and that any connection "may be laid to the prevalence of well-known pious introductory formulas". 
- lines 1-102
- lines 103-234
- Genesis B, lines 235-245
- Genesis B, lines 246 ff
- Killings, Douglas B. (1 August 1996). "Codex Junius 11". Project Gutenberg. Retrieved 17 March 2015.
This work is generally believed to be a composite of two separate poems . . . The reason for this interpolation is not known. Perhaps the original compiler preferred the version of the story presented in "Genesis B", or perhaps the text of "Genesis A" from which he was working with was missing this section.
- Wrenn, C.L. (1967). A Study of Old English Literature. New York: Norton. p. 99. ISBN 978-0393097689.
- Michel, Laurence (1947). "Genesis A and the Praefatio". Modern Language Notes 62 (8): 545. JSTOR 2908618.