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tripledigitken
Ultra Nomad
Posts: 4848
Registered: 9-27-2006
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I'm guessing 65+
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Skipjack Joe
Elite Nomad
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Location: Bahia Asuncion
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El Roario's Mama Espinoza's restaurant has local ammonites on display. These animals ranged from 500M to 65M BC. So the fossils and the peninsula is
at least 65M years old. Muy viejo.
http://en.wikipedia.org/wiki/Ammonoidea
[Edited on 2-17-2013 by Skipjack Joe]
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geomike
Junior Nomad
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Mood: feeling an irresistable pull towards Baja...
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| Quote: | Originally posted by tripledigitken
I'm guessing 65+
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The winner is trippledigitken as long as he was talking about the rocks in the El Rosario area and as long as he meant 65+ Million years!
David here is a link to a google earth .kmz file from the UCSD. I'm not much of a hand with Google Earth but I know you are. It opened up a really
slick Geologic Map of Baja California
Geologic map of Baja
There is no Legend attached to the map
Look for the El Rosario area and you will find extensive areas of light green rock with splotches of tan and brown.
The light green is labeled Krm. "K" stands for Cretaceous and the rm would be a local formation name abbreviation (probably "r" for Rosario "m" for
marine)
The tan and brown colored areas are rocks of Tertiary age ("T" indicates Tertiary)
So in this area we have rocks spanning the famous Cretaceous Tertiary Boundary, at 65.5 Million years.
The K-T boundary (65.5 Million years before present) is most famous for killing off the Dinos. Less so (and in my opinion more tragically) it is the
end of the Ammonites!
There is a building front in El Rosario (about half way through town maybe about opposite of the Sinai Hotel and RV park) that has huge specimens of
this beautiful fossil creature incorporated in the masonry facing. Wish now I had made the picture stop.
You are entitled to your own opinions...not your own facts.
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wessongroup
Platinum Nomad
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thanks mike, way cool link ...... wished they had this back when I was in school, what a tool at ones finger tips ... it all good
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Skipjack Joe
Elite Nomad
Posts: 8088
Registered: 7-12-2004
Location: Bahia Asuncion
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Too bad about the missing legend. If you have the time and desire a time period of the remaining 7 colors would be helpful.
This looks like a really worthwhile book to purchase. But pricey.
http://www.amazon.com/Reconnaissance-geology-California-Geol...
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David K
Honored Nomad
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Thank you geomike and others for your links and comments. I have collected fossils in the Yuha desert in the 60's, and recall the old timer in
Ocotillo, CA telling us they were 10 million years old. I just started writing a new article and wanted to provide the best estimate, plus (as Blanca
says) this is interesting.
Thanks for the photos Roger.
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Taco de Baja
Super Nomad
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| Quote: | Originally posted by David K
I have been spending a long time on Google search.... and it's worn me out! LOL
Would someone in-the-know... know?
I welcome anyone with some geology or rock-hound expertise!
I have seen fossils at El Rosario, Las Pintas, south of San Felipe, near Bahia Asuncion, and, well lots of places. Either they are several miles from
the beach or hundreds of feet above sea level, or both!
How old are the fossil shells, sharks teeth, and other items turned to rock we see in Baja?
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Lots of different ages from 10,000 +/- to 10s of millions.
The ammonites and wood around El Rosario is Late Cretaceous (dinosaur times).
Much of the stuff in Baja with shark teeth (Rosarito/Tijuana, Bahia Asuncion, Punta Blanca) are Miocene (23 to 5 million).
The areas with Ice Age Animals (Bison, horse, camel, mammoth and mastodon, sloth, - Think La Brea Tar Pit type animals) are from the middle to Late
Pleistocene (~300,000 to 10,000 years ago).
As stated earlier, the Google Earth KMZ layer is not too useful without the geology key...But the formations/units that begin with an uppercase ”Q”
are from the Quaternary (~2.58 million years [1.8 million in older texts] ago to the present); those beginning with a "T" are from the Tertiary (~65
million to 2.58 million years old); those with a “K” are from the Cretaceous (~145 -65 million years ago). Colors also give some info: Light browns,
yellows, and greens are generally sediments, pinks and reds are granitic or intrusive, dark browns and oranges are volcanic, purples, blues, and dark
greens may be metamorphic.
http://www.geology.sdsu.edu/kmlgeology/kmz/baja140/baja140.html
Truth generally lies in the coordination of antagonistic opinions
-Herbert Spencer
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David K
Honored Nomad
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Guys... good news! I HAVE this geologic map of Baja (Norte), it is huge, in three sections, and I will scan the 'key' to what all the letters stand
for.
Thanks a lot GeoMike and Taco de Baja... The only Nomad geologist I know is GeoRock, and she just doesn't post here much...
I will try and get the legend for the 1971 geology map up this afternoon!
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bajacalifornian
Super Nomad
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Friggin' old . . .
American by birth, Mexican by choice.
Signature addendum: Danish physicist — Niels Bohr — who said, “The opposite of one profound truth may very well be another profound truth.
Jeff Petersen
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David K
Honored Nomad
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1971 Legend and close up of the rock type codes
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geomike
Junior Nomad
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Saaweeet! treat that map with great care David! The replacement cost is HUGE!
GSA Memoir 140
And if you ever want to capitalize that asset please call me first!
Thank you for the scan!
You are entitled to your own opinions...not your own facts.
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boe4fun
Super Nomad
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My wife says I'm so old that I fart dust!
Two dirt roads diverged in Baja and I, I took the one less graveled by......
Soy ignorante, apático y ambivalente. No lo sé y no me importa, ni modo.
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Taco de Baja
Super Nomad
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Mood: Dreamin' of Baja
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| Quote: | Originally posted by David K
1971 Legend and close up of the rock type codes
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Thanks David!
There is a copy over at my mom's that my dad bought soon after it was published....but I have no idea where it might be.
Truth generally lies in the coordination of antagonistic opinions
-Herbert Spencer
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BigOly
Senior Nomad
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Location: Los Barriles, Bandon
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Thanks David!
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Ateo
Elite Nomad
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This is a fascinating topic. I explode with interest when thinking about holding something that is 100,000,000 years old!!
I want to own a meteorite someday. Just knowing that thing was floating around the Solar System for billions of years is now sitting on your mantle
would be (in a Huell Howser voice) AMAZING!!!!
We live in a pretty magnificent reality.
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David K
Honored Nomad
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If the map wasn't so huge, I would scan it... but the link to kmz file of it for Google Earth seems to work great at zoom ins.
I got the map in the mid 1970's by ordering it from the publisher. I can't recall where I first saw it to get the address? It has dirt roads on it
that just weren't on any other maps (well in the early 1970's the Lower California Guidebook had the best maps of roads... and they are still good
today if you can overwrite them with the new paved and graded roads. This 1971 map had the 'Azufre Wash' (Cańada el Parral) road from near the sulfur
mine across to Valle Chico (with 'abandonada' next to it) and helped me find it in 1978 after I had been searching since reading about it in the older
edition of 'Camping and Climbing in Baja'... the newer editions edited out any mention of it. It also had the back road that goes between San Quintin
and El Arenoso, avoiding El Rosario, used for Baja races sometimes since 1973 (avoiding the new paved highway).
The legend is also in Spanish in the opposite corner of each map.
In the bottom corner of the 3 part map is "Copyright 1973, The Geological Society of America, Inc."
Zoom in on it and see lots of previously unmapped roads, specially for 1971. The "improved road" ended at about where Jardines in San Quintin is
today... but pavement was not past Camalu.
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David K
Honored Nomad
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| Quote: | Originally posted by geomike
Saaweeet! treat that map with great care David! The replacement cost is HUGE!
GSA Memoir 140
And if you ever want to capitalize that asset please call me first!
Thank you for the scan! |
That is the memoir (#140), but I wonder if it it included the 3 piece map?
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David K
Honored Nomad
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Valle Chico, Parral, Matomi....
.. and the abandoned road to the sulfur mine...
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mtgoat666
Platinum Nomad
Posts: 20376
Registered: 9-16-2006
Location: San Diego
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Mood: Hot n spicy
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| Quote: | Originally posted by Ateo
This is a fascinating topic. I explode with interest when thinking about holding something that is 100,000,000 years old!!
I want to own a meteorite someday. Just knowing that thing was floating around the Solar System for billions of years is now sitting on your mantle
would be (in a Huell Howser voice) AMAZING!!!!
We live in a pretty magnificent reality. |
If you like old rocks, there are Precambrian sedimentary rocks just north of san Felipe. No fossils though. Not so sure they are really Precambrian,
jury is undecided
There are some Ordovician conodonts in Guadalupe valley area.
According to creationists none of these rocks are more than 6 or 7 thousand years old. Same people say man can't change climate. Ha,ha. So a man can
create the world in 7 days, and billions of people can't change the world in a century or 2. Ha, ha.
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David K
Honored Nomad
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Man didn't create the world, silly goat.
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