Pre-History to 1799 A.D.
250-180 million B.C.
During the Triassic-Jurassic Period, the rock formation that would become
known as the Bedford Canyon Formation on the eastern slope of the Santa Ana
Mountains, the oldest known rock formations in the future OC, begins to form
deep beneath an ancient ocean.
65 Million Years Ago
Toward the beginning of the Cenozoic Era, the Los Angeles-Orange County Basin
and mountains lie beneath swampy sea-marshes and lagoons, receiving sediment
from large rivers flowing out of the low-lying ancestral Nevadan mountains.
Dinosaurs are extinct. The San Gabriel and Santa Ana Mountains begin to form.
24 to 5 Million Years Ago
At the beginning of this era, what will become the Los Angeles-Orange County
Basin lies beneath a deep, subtropical sea and, before the San Andreas Fault
begins its push, is located about 100-150 miles southeast of where it is today.
Land begins to emerge, with the local shoreline running along the San Gabriel,
Santa Monica and Santa Ana Mountains and the Covina Hills. These ancient hills,
ripe with volcanic activity, rise to no more than an elevation of 1,000 feet.
Dry land around the submerged Los Angeles-Orange County Basin is subtropical,
receiving about 30-40 inches of rainfall a year. It is covered with scrub forest
and inhabited by ancient horses, rhinoceros and camels.
5 to 1.8 Million Years Ago
Los Angeles-Orange County area hills are forced upwards in
height to become mountain ranges. The sea level drops.
1.8 Million to 10,000 Years Ago
Large mountain ranges now are present and the Los Angeles-Orange County
Basin, formed from accumulating sediment deposits, slowly rises from the sea.
The shoreline recedes to about where it exists today. The climate is cooler and
moister than present, similar to that of present-day Monterey Peninsula, with
glacier activity along the peaks of the San Gabriel and Santa Ana Mountains. The
basin becomes a large grassy, brush-covered and marshy plain, roamed by
Saber-Tooth Tigers (or Saber-Tooth Cats), Giant Ground Sloth, Dire Wolves,
Western Horses, Ancient Bison, Short-Faced Bears (Artodus Simus), Columbian
Mammoths, American Mastodons and many other now-extinct species. A number of
these animals find themselves unwittingly trapped in the tar fields of what will
be known as the La Brea Tar Pits.
The Saber-Tooth Tiger (or Saber-Tooth Cat) becomes extinct in
Southern California. The Los Angeles Basin is covered in grassy plains with
scattered strands of junipers and cypress trees, streams, marshes, small lakes
and ponds. The Chumash begin settling in coastal villages in the Los Angeles
area. A young women who would later become known as Laguna
Woman, dies in the Laguna Beach area of OC. A portion of her skull is unearthed
thousands of years later in 1933 in a
Laguna Beach backyard by amateur archeologist Howard Wilson.
The first non-Chumash Indians arrive in Southern California
from the Mojave area.
Juan Rodriquez Cabrillo anchors briefly off the coast of what
would become Orange County, California.
The expedition led by Captain Gaspar de Portola
passes northbound through OC. They name a few geographical features such as the
Santa Ana Valley, Santiago Creek and Trabuco ("Spanish for Blunderbuss" – so
named for the type of firearm lost there) Mesa, Creek and Canyon. The great
river encountered in OC is named Nombre Dulce Jesus de la Temblores
"Sweet Name of Jesus of the Earthquakes" (future Santa Ana River). This name
also makes mention of the first recorded earthquake in OC. Two priests
accompanying the party are Fathers Juan Crespi and Francisco Chlifamia who
perform baptisms of two Indian infants believed to be dying in an Indian village
in Cristianitos Canyon. The baptisms are the first performed in California.
The Portola expedition again passes southbound through OC on
its return leg.
Missionary priests take possession of the original (and still undetermined)
site for the Mission San Juan Capistrano. Father Junipero Serra receives
permission to establish the seventh mission, Mission San Juan Capistrano. It was
named for the Franciscan saint and hero of the 1456 Siege of Belgrade, St. John
of Capistrano. Construction on the mission was halted when the soldiers assigned
to the mission are recalled to San Diego to respond to an Indian uprising. The
heavy iron mission bells are buried and the site is abandoned.
Missionary priests return to the site of the unfinished Mission San Juan
Capistrano, abandoned in the previous year. The cross was still standing. The
mission bells were dug up and construction was completed. Father Junipero Serra
attends the official dedication of the seventh California mission and remains
for a month to oversee continued construction. When leading a supply convoy of
carretas from the Mission San Gabriel to San Juan Capistrano, his convoy,
guarded by a single soldier, encounters a hostile band of Indians. A native
interpreter explains to the Indians that Serra is a good man who means no harm.
Besides, the interpreter cunningly warns, a contingent of soldiers follows
closely behind. After the Indians receive a gift of glass beads and Father
Serra’s blessing, the convey is allowed to pass without further incident.
Fathers Amurrio and Pablo Mugartegui were left to manage the mission along with
a detail of 10 soldiers.
The Mission San Juan Capistrano is moved from its original site to its
current location to be close to a better source of water. The original site
remains uncertain although it is believed to have been three miles east of the
present site. The mission counts 1,562 Indian residents.
Work begins on the great stone church for the Mission San Juan
El Pueblo de Nuestra Senora la Reina de Los Angeles ("The Town of Our
Lady the Queen of the Angels" - future Los Angeles) is founded. It serves as the
center of local government for the OC area for the next 108 years.
A young women who would later become known as Laguna
Woman, dies in the Laguna Beach area of OC. A portion of her skull is unearthed much later in a
Laguna Beach backyard by amateur archeologist Howard Wilson in 1933.
The first land in the future Orange County is given to a soldier, Manuel
Perez Nieto. The grant extended from the San Gabriel River (in modern day Los
Angeles County) to the Santa Ana River. The second grant and first entirely
contained within OC is given to Juan Pablo Grijalva and his son-in-law Jose
Antonio Yorba. It is named Rancho Santiago de Santa Ana and includes 62,000
acres of what is now Santa Ana, Orange, Tustin, Olive, El Modena, Villa Park,
Costa Mesa and portions of Newport Beach.