3286 B.C. The birth of Lamech (poor, or made low). ” And Methuselah lived an hundred eighty and seven years, and begat Lamech:

3230 B.C. The death of Adam ( 930 years old). ” And all the days that Adam lived were nine hundred and thirty years: and he died.: ( Genesis 5:5)

3104 B.C. The birth of Noah (rest). “And Lamech lived an hundred eighty and two years, and begat a son: And he called his name Noah, saying This same shall comfort us concerning our work and toil of our hands, because of the ground which the Lord hath cursed.” ( Genesis 5:28,29).

*There were Giants in the earth.

“There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty  men which were of old, men of renown.” ( Genesis 6:4)

The death of Enos ( 905 years old). ” And Seth lived an hundred and five years, and begat Enos: And all the days of Enos were nine hundred and five years: and he died.” ( Genesis 5: 6,11).

” And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually. The earth also was corrupt before God, and the earth was filled with violence.” ( Genesis 6:5,11).

The  monsters did exist and you’ll even find records of them in the Bible in the ” behemoth”, and “leviathan”‘ the mastodon and the dinosaurs of Job Chapters 40 & 41