An early estimate and a later estimate remain separately visible
Retain an identifiable earlier account, connect it to a clearly later revision, and state what new evidence changes or leaves unresolved so readers can distinguish the two states of knowledge.
The Sea Around Us
Rachel Carson · 81 weeksAn early estimate and a later estimate remain separately visible
SHORT SOURCE EXCERPT“constantly undergoing revision”
The opening discussion offers a minimum Earth-age estimate tied to the oldest rocks then described and carries an asterisk. The linked note explicitly describes ongoing revision, adds older findings and presents a substantially longer possible age. The later account is identifiable rather than silently substituted into the original passage.
The paired passages make a changed estimate and its stated basis inspectable. They also demonstrate why the revision link matters: the main paragraph can convey a different temporal scale if read alone.
The source in context.
An explicitly reconstructed account moves from the formation of Earth and ocean through the emergence of life and eventual human exploration. A linked revision note changes the temporal scale offered in the opening discussion.
Open this chapterWhat this example supports
The paired passages make a changed estimate and its stated basis inspectable. They also demonstrate why the revision link matters: the main paragraph can convey a different temporal scale if read alone.
Its limit
These are historical estimates and methods as reported by the source. The note is evidence of a change in the book’s account, not an independent validation of either estimate or a complete history of geochronology.
Source & edition
Rachel Carson, The Sea Around Us; supplied Open Road Integrated Media ebook, publication statement 2011, ISBN 9781453214763; includes the Preface to the 1961 Edition and revision notes alongside the earlier narrative.
Supplied text, lines 141–215. The short quotation is checked against the source.
The completed whole-source AI synthesis supplied candidate observations and the broad argument map. This Codex editorial pass checked original source headings, section boundaries, openings and selected argumentative contexts; inspected every retained example; checked the existing pattern dictionary and base examples; and rewrote or rejected nominations. It is a source-checked editorial pass, not a new independently adjudicated whole-book reading.
supplied Open Road Integrated Media ebook, publication statement 2011, ISBN 9781453214763; includes the Preface to the 1961 Edition and revision notes alongside the earlier narrative