Im aware of Hoagland. HES A FUCKIN LOON who is merely media hungry. He used to be a regular guest on that overnight"UFOs are all over the place" show . I though he died .
There are plenty of pseudomorph forms from the photos taken by the Rovers. Crinoids? Im not so sure that he even knows what one looks like.
The fact that we have crinoids (All 3500 genera of them) through time, its easy to compare a segment of a crinoid columnal with the photo of something that looks similar isnt , by any means, a positive ID. If you believe Hoaglands bullshit, I suppose youd buy bewildereds.
Hoagland had a decent reputation as a physicist one time (before he went a bit over the edge). A decent reputation in one area, however, doesnt confer any credibility in another.
Its like that "face " that everyone swore up and down was on the red planet. Closer inspection showed it was just some natural topographic feature.