Almost constant volcanic eruptions begin on Romulus (128 Trianguli II).
In a billion years fresh water will be rarer than dilithium [GN 22].

Roughly during this time period, in another galaxy, the "Intellivore"
(also known as the "Iruhe" and "Iaehh") planetary group mind thrives.
Over a thousand years they build a planet with an array of warp
engines, powered by some 800 pools of antimatter. Thriving on the
mental energies of other beings, the immense planetary ship will
drain its home galaxy dry of life. Then it will take to
intergalactic space and enter our galaxy. The Intellivore will
either directly or indirectly be responsible for the decline of
many old races [TNG #45, TOS #35].

The advanced space-faring race known as the Skour inhabit the Rigel
system [FASA].

444,310,700 B.C.
Period 1 begins on the planet Alcawell in the Delta Quadrant of the
galaxy, the first segment of a society spread out through almost a billion
years of time. The time-travelling Alcawellians' world consists of
periods. Each period spans 500,000 years. Mean Time Control Headquarters
is located in Period 1, which is where Chief Engineer Torres, Ensign Kim,
and Neelix are taken from Period 889 to face the charges of intraperiod
travel and the consequent Time Alarms. In alternate timelines, the three
"Voyager" members are executed for the crimes [V #2].

401,310,700 B.C.
Period 87 begins on Alcawell in the Delta Quadrant. After promotion, Red
moves to Southern City in this period--crowded, but not as bad as Period 1
[V #2].

300,000,000 B.C.
An alien ship of insectoid beings is invaded by a magnetic organism.
Trapped in orbit of Questar M17, the crew disable their own ship to
prevent the spread of the entity [BFS/a].

299,810,700 B.C.
Period 290 begins on Alcawell in the Delta Quadrant [V #2].

The Vedala race probably thrives during this era. They will be known as
the oldest living spacefaring race by 2264 [Ji/a].

Environmental conditions on Thasus change and will remain stable for
the next 3 million years [ST 1].

150,000,000 B.C.
The planet Mirage is formed [TOS #74].

100,000,000 B.C.
The geological situation on Rimillia is established when the planet's
rotation slows, narrowing the habitable zone down to a narrow strip at
the terminator [TOS #77].

A series of relay stations is established in the Delta Quadrant of space,
capable of reaching the Alpha Quadrant. These stations are powered by
quantum micro-singularities and will last over 100,000 years [V 183].

The Masters become the fourth native civilization in the Rigel
system. An early understanding of philosophy and science allows
them to build a massive empire in the Orion arm of the galaxy which
will endure for 100 million years. The Masters will perform many
experiments on life forms and civilizations much like the
Preservers [FASA].

97,310,700 B.C.
Period 715 begins on Alcawell in the Delta Quadrant [V #2].

86,997,600 B.C.
An immense informational archive is constructed by a civilization in the
Darsays system, near Sector 1156. Over the passage of time it will drift
into interstellar space and be taken for a comet [TNG 269].

86,810,700 B.C.
Period 716 begins on Alcawell in the Delta Quadrant [V #2].

65,000,000 B.C.
Prior to the cataclysmic extinction of the dinosaurs, the Voth
people (sentient descendants of Hadrosaurs) achieve spaceflight and
depart Earth (or are transplanted by the Preservers?). Some 45 million
years later they will have reached and colonized the Delta Quadrant
(probably through the advent of transwarp drive). No record of their
species will remain on Earth [V 165].

64,020,410 B.C., June
In southern Georgia on Earth, Captain Kirk and a landing party (trans-
ported from 2264 via the Guardian of Forever) see to the impact of an
asteroid, ensuring the extinction of the dinosaurs. The Clan Ru at first
succeeded in altering history by destroying the asteroid with a matter/
antimatter warhead satellite. Kirk convinces the Ru that their distortion
of history would only result in their own extinction after comparing DNA
samples. In the Ru-created alternate universe, the dinosaurs will evolve
semi-intelligence only to exterminate themselves in endless cycles of
nuclear warfare. There will be no Federation, while the RomulSngans and
Klingons become locked in endless interstellar warfare. In the "proper"
timeline, the asteroid's impact will directly contribute to the extinction
of the dinosaurs and the evolution of Mankind. Prior to their demise, the
Preservers will visit Earth and transplant the dinosaurs, allowing them to
evolve and thrive on the Clan Ru homeworld. Note that the asteroid's
impact was inadvertantly caused by Q millions of years in the future
[TOS #75, TNG #49].

45,000,000 B.C.
In the Clan Ru alternate universe, Earth's dinosaurs begin evolving intel-
ligence, civilization, and war. In 2264, Captain Kirk and a landing party
view this alternate timeline on the Guardian of Forever [TOS #75].

20,310,700 B.C.
Period 849 begins on Alcawell in the Delta Quadrant [V #2].

20,000,000 B.C.
The mysterious stone known as the Devil's Heart, Bloodstone, Dream Gem,
Ko N'ya, Nota, Telev's Bane, Pagrashtak and many other names over its long
history, is created by the Architects (Originators). It has the same
properties as that of the Guardian of Forever and will become a talisman
to many races. To the Iconians it will be a key to opening the Three
Gates and allow their civilization to colonize other worlds. The Ko N'ya
may possess semi-sentience and may be a seed to grow another Guardian of
Forever [GN 13].

The Voth settle in the Delta Quadrant and their recorded history
(devoid of their origin on Earth in the Alpha Quadrant) begins anew
[V 165].

12,310,700 B.C.
Period 865 begins on Alcawell in the Delta Quadrant [V #2].

12,000,000 B.C.
The Cetaceans colonize Earth