Day 1
God formed and filled over the next few days.
(There was no previous heavens and earth)
I believe Ps 104 is describing a renewing of earth. Thus new heavens, earth, seas were made in 6 days.
24 O Lord, how manifold are thy works! in wisdom hast thou made them all: the earth is full of thy riches.
25 So is this great and wide sea, wherein are things creeping innumerable, both small and
great beasts.
26 There go the ships: there is that leviathan,
[plesiosaurus] whom thou hast made to play therein.
27 These wait all upon thee; that thou mayest give them their meat in due season.
28 That thou givest them they gather: thou openest thine hand, they are filled with good.
29 Thou hidest thy face, they are troubled: thou takest away their breath, they die, and return to their dust.
[mass extinction]
30 Thou sendest forth thy spirit,
[Gen 1:2] they are created: and thou
renewest the face of the earth.