Alright, I've dug up a few articles, some more or less interesting than others. Here is one that is specific to nautiloids (see below).
On the topic, as I mentioned earlier on our discussions, the world just isn't a computer simulation. We cannot expect that every single sea shell ought to point in a direction of current (though some patterns are apparently, and we also cannot expect all shells to become buried in a perfect parallel fashion to grade.
Just the same as in the prior article that largely discussed ammonites. They were in some cases narrow shellfish, and while most were ultimately buried in a horizontal fashion, others were not.
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I would recommend reading the section on paleoecology, though I've also pasted an image discussing the vertical positions of shellfish of the study. Much like the prior article we looked at, stratigraphy and biostratigraphy indicates a shallow marine environment. There are corals and sponges for example. We don't find T Rex roaming through the subject bedding, we find animals specific to shallow marine environments. We find shales and mudstones. In some cases the environment is rich in calcite or it is carbonaceous, but we don't find stratigraphy indicative of a terrestrial setting.
And it's kind of the same theme paper after paper. Similar lithologies, similar shallow marine fossils, a lack of terrestrial fossils or features, often these papers are distinguishing between oxygen rich and oxygen poor marine environments. And they continually suggest the same details. The shellfish dies, orthoconic nautiloids float with their anterior side down. They sink to the bottom and fill with sediment.
Most fall to their side and orient with a current (if they're in such an environment), some orient perpendicular to current. Most remain horizontal and some dip at angles.
I think that, from the perspective of those who study cephalopods, there doesn't appear to be any concern about whether or not a shell at an angle would be a challenge for an old earth or uniformitarian view. And I would tend to agree, simply on the basis that the world isn't a computer simulation. We shouldn't necessarily expect all shells to be parallel to bedding, no more than we should expect any other fossil of any other species to always be parallel with bedding. Most? Sure. All? I would never guess as such.
These shellfish in particular, they're being jostled by currents. Just as shellfish are today. Go to any beach and you can watch shells tumbling, they're getting buried at all angles, they live in an environment that is in motion. And if you move away from the shoreline, those currents are still actively in motion, moving animals that live within them.
With that, I don't think there is any reason to believe that shellfish, should never be buried at an angle, be it an elongated ammonite, or a pencil shaped nautiloid. Especially if models indicate that nautiloids can also float and sink in a vertical position. It's simply a matter of the current not overtaking every single shell.
Here is an article discussing re working of fossils:
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This second article is discussing horizontal orientation, but it gives suggestions for why shellfish also may not align with a current, which is also applicable to considerations related to the angle in which they're buried. It basically discusses ideas related to reworked fossils where there are currents shuffling shells around.