|
Our son attends the College of Creative Studies at UCSB. I was hoping you could help me. I continue to find interesting rocks buried on our farm which have been uncovered while working the land. These rocks today were uncovered after my metal detector located them several feet deep. The bigger rocks look metallic, like gold, and are heavy. I read that a possible meteor was sighted in 1914 over Mission Canyon, and we live in that area (above San Roque.) Was that fall ever discovered? These lands weren’t developed until the 80’s, and our sloping land, unlike other neighbors has an interesting bowl shape and looks very different from our neighbors. meteor falls in mission canyon
Could these rocks possibly be meteorites? I’ve found legions. Google Lens identifies many of these rocks I find, many of which are sort of diamond shaped, as meteorites, dinosaur bones or Indian artifacts. I think I’m on a wild goose chase.
These rocks are a small sample of my finds. I thank you in advance for your assistance.
Pictures of my samples:
Rocks 1
Rocks 2
Rocks 3
|
Question Date: 2021-09-19 | | Answer 1:
It is essentially impossible to use only those photos to conclusively determine whether any of those rocks are meteorites. They do have some features in common with meteorites, namely that they apparently contain metal (assuming your metal detector detected these rocks and not something near them), their weight (meteorites are typically denser than terrestrial rock and therefore heavier of similarly sized Earth-stones), and the black covering on all of the rocks in the third picture might be mistaken for fusion crust.
Unfortunately, there are more indications that these rocks are not meteorites. The rocks in the first two pictures appear to have rough surfaces and fairly sharp corners/angle; the trip through the atmosphere generally smooths corners and produces a thin black skin called a fusion crust on the surface. In addition, the top left rock in the second picture (the one cut off by the side of the image) has clear stripes - meteorites never have stripes because those form when gravity compacts layers or gradual erosion by wind/water. In the third picture, all of the rocks have at least some black coating, and as mentioned, meteorites are typically covered in a thin black rind called a fusion crust. However here the black appears rough and patchy, not smooth and glassy/shiny, and I can't see shrinkage cracks in them. They look more like hematite coatings as shown in the third group of photos here (last set before Onion-Skin Weathering).
Furthermore, none of these rocks have regmaglypts, which are sort of dimples or depressions on the surface (not all meteorites have these, but many do). Also against the notion that these might be meteorites are the size and sheer number of them all found in one place.
Here is data on the masses of meteorites; more than 75% are <1 kg in mass (less than 1 Kg in mass). My best guess from the images is that many of these are near or over that. Finding this many meteorites so close together is also unlikely. Fragments are generally spread over a wide area called a strewn field. These fields are on the order of several square miles, not a single small farm. For example, the Sutter's Mill event in 2012 spread meteorites over an area roughly 4 mi x 2 mi.
Another example, the densely covered "Franconia strewn field" yielded (as of 2004) only 87 meteorites from an area 5 x 16 km. Across the entirety of the US, fewer than 2000 meteorites have been found.
For more information on the characteristics of meteorites, see these sites ( Washington Univ. ), ( Earth Science Australia ), ( Clemson Univ. ), ( Geology.com ). WUSTL also has this flowchart to help you to work through several tests of whether a rock might be a meteorite. | | Answer 2:
Mosasaurs went extinct 65 million years ago probably due to the impact of a 10 km asteroid with Earth in what is now the Yucatan peninsula. i don't know where your farm is but Coastal SB county is mainly Tertiary age rocks YOUNGER than 65 Ma.
Turritela is quite common and related genera so that might be a correct ID.
You can show your stone tool finds to archeologists at UCSB and they can make a better ID.
As far as meteorites, the pictures are not particularly convincing. The ratio of meteorite to meteor wrongs is about 1/1000 in my experience.
| | Answer 3:
Thanks for sharing the various finds you've been making on your farm. Not to dampen your enthusiasm, but I have to think that Google Lens (which I've not used myself) is leading you astray by providing you interpretations far more specific than the evidence supports. Scientists are always open to being proven wrong, but that's my assessment based on what I've seen.
Let's start off with the most plausible find--an object that GL identifies as Turritela. That's a well-known fossil from a marine rock formation in our area, so its appearance on your farm is not unexpected. Considerably less plausible, however, is the occurrence of Globigens, a mosasaur, as you note, an extinct marine squamate (the term "lizard" is falling out of favor in taxonomy--but that's a different story). The reason I'm suspicious of this identification is that mosasaurs lived only during the Cretaceous, the same time that T. rex lived, and there are few fossil-bearing rocks of this age in Santa Barbara Co., let alone in California. You probably can't think of any California dinosaurs, because they practically don't exist. Rocks of the right age and kind simply weren't deposited here.
I can speak about your potential archaeological and meteorite finds with only more limited authority, but here too I think GE is leading you off track.
Bottom line, it seems like some of the objects you've found are what you think they are, and some aren't. That doesn't make it less fun to search for mystery items in the ground. Happy hunting!
| | Answer 4:
I wouldn't trust Google Lens, based on my limited experience. One of the rocks from the first picture looks like it had a hole bored through it, probably by humans. Rocks 2 also looks like normal Earth rock, perhaps sandstone. I don't know about rocks 3. I asked someone on LinkedIn about your question. They know more about space stuff than I, but they haven't replied. I recommend that you check out meteorite on Wikipedia.
| | Answer 5:
Can you look at a geologic map that would show where your farm is located (link below)? That would tell us the age of the rocks on your property, and with it the chance that you have the fossils that you describe on them.
Geology State
I'm afraid I can't identify them as tools as I'm not an archaeologist, although I believe the Chumash were (are) sophisticated enough that their tools would be unambiguous.
Click Here to return to the search form.
|
|
|
|
|
Copyright © 2020 The Regents of the University of California,
All Rights Reserved.
UCSB Terms of Use
|
|
|