Posts treating: "90 degrees"
Friday, 10 June 2016
I found a few specimens of a colonial rugose coral with some really deep corallites in the Martin formation north of Payson, AZ. At first I thought they might be Hexagonaria sp. but the cup depth is much greater than that genera. So, after researching a bit more, I think I have Spongophyllum sp. specimens. Here is the description for the genera that Ermin C. Stumm wrote in his paper "Upper Devonian Compound Tetracorals from the Martin Limestone", Journal of Paleontology, Vol. 22, No. [...]
As may be expected, one of the more common brachiopod fossils from the Bois d'Arc formation is Leptanea rhomboidalis. The shell of the specimens I found are typical for the species with a rectangular outline when viewed from the dorsal or ventral side. Both valves are relatively flat with wide, concentric growth rings and decorated with fine striae The margins of both valves (except along the hinge) are turned 90 degrees from the rest of the shell and this is most noticeable at the [...]
My German colleague and I could conceptualize five kilometers horizontally—the same as her bike ride to work, the same as the first ever race I ran. Neither of us could quite grasp what flipping 5 kilometers 90 degrees might mean, as our pump continued on its 3-hour vertical journey to that
Earthly Musings [2015-12-28 17:15:00]
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Cretaceous,Jurassic; BE,US,
Before I ever had a chance to visit the Antarctic Peninsula, a fellow naturalist said to me, "When you go, may you have a sunny day in the Lemaire Channel." I never forgot those words and in my 28 trips here I've seen a few of those. But this years trip was super special, as well as a hike to the top of a hill in Neko Harbor.High pressure beginning to set in along the Antarctic Peninsula.The visuals are outstanding. It is like seeing Alaska, New Zealand or Norway 20,000 years ago when the Ice [...]
According to Hall's "Paleontology of New York", Volume 6, pg. 9, pl. VII, fig. 1-12, the specimen below may be Favosites sphaericus. It has very small cells, similar to a bryozoan, but forms hemispherical mound shape and has an epitheca. Here is Hall's original description:Corallum massive, variable in form. Cell tubes polygonal, generally hexagonal;length from 2 to 13 mm. or more; diameter from .25 to .35 mm. On the surface are frequent maculae .5 mm. in diameter, where the cells are larger [...]
When you compare the previous brachiopod I posted about, Rhytistrophia beckii, to today's fossil, Leptaena rhomboidalis there are some key differences. Both are large shells that are semiellipical (half moon shaped) to subquadrate (nearly square) with straight hinge lines. The valves of both shells are nearly flat but the margin of the shell in L. rhomboidalis is turned 90 degrees from the regular shell surface all along the edge. Another distinguishing feature is the somewhat regular, [...]
The Devil gets blamed for a lot of stuff, and who am I to say he isn't responsible for bad things? But one can hardly blame us for blaming him for massive earthquakes when he goes around leaving things next to major fault systems, like punchbowls.
Southern California is a tortured landscape, and it isn't just the pop culture. The entire region has been twisted more than 90 degrees from
Ever wondered how ripple marks form in wet sand? This ELI gives you the answer -
Sand ripple marks in a tank'
We have received a really good extension idea for this activity:-The tank can be rolled back and forth on pieces of broom handle rather than lifting it up and down – less tiring and more controllable. Once the ripples have formed, move the broom handles through 90 degrees
One of the most common fossils found in the Cretaceous sediments of New Jersey and Delaware are the cigar colored and shaped guards (rostra) of Belemnitella americana. They are called guards but were actually internal supports/skeletons of the animal. B.americana belonged to a group of squid like creatures called Belemnites that have relatives in the modern cuttlefish. When they existed during the Jurassic and Cretaceous they were prolific and sometimes formed massive shoals with their [...]
Here is a fossil from the Centerfield member of the Ludlowville formation (Devonian, Givetian stage) with an interesting Aulopora growth pattern. It's a section of a rugose coral (possibly Eridophyllum sp.), herein referred to as "substrate", that was colonized by an Aulopora polyp. The Aulopora wraps around the substrate in one predominant direction which indicates to me that it was adapting to the substrate turning as the results of currents or storms.Here is the presumptive "bottom of the [...]
We had a non-winter and a super mild spring - minimal rain, lovely temperatures. I was really not prepared for it to be over 90 degrees and humid today. It didn't help that I was lifting and moving around a bunch of heavy stuff that had been baking in the sun all morning.
So today was annoying and hot. Worse, I ended up with some lovely heat rash to plague me now that I'm inside and
On the last trip I took up to the Verulam formation quarries this past fall, I finally found my first enrolled Flexicalymene trilobite. Here it is "in situ" as I found it.I found the trilobite on the large mounds of crushed rock that had been set aside as a reserve. It's rather remarkable that the fossil survived the crushing process intact. Here is what it looked like when I picked it up.And here it is once I got it home to be cleaned up. Looking down on the cephalon, essentially the "top" of [...]
