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Here are Ornithopod long bones (not Sauropod Vertebrae):
Osteon remains of the bones are visible in Figures B, D, and F.
(Note: If you cannot see osteon remains in Fig.B of http://svpow.com/tag/histology/, then you cannot see osteon remains in “Pinnacle Island”.”
Osteon remains in Fig. B closely resemble structures found in the Martian Mystery Rock “Pinnacle Island”, which are marked in the following photos:
www.flickr.com/photos/fossil_lin/11863600715/
www.flickr.com/photos/fossil_lin/11959984685/
www.flickr.com/photos/fossil_lin/11964778494/
www.flickr.com/photos/fossil_lin/11995797254/
www.flickr.com/photos/fossil_lin/12117521644/
Added on Feb.11: Description of osteons in Fig. B
Osteon remains in the above-mentioned Fig. B (shown in http://www.flickr.com/photos/fossil_lin/12364898835/)
are marked and described in details in http://www.flickr.com/photos/fossil_lin/12449846913/
Note the green circles mark only the osteon remains most commonly seen in textbooks. Outside the green circles are unmarked osteon remains not easy to recognize.
Image source: see third story in www.sciencebuzz.org/buzz_tags/dinosaur_bones
Added on Feb. 14: Difference between Earth and Mars Fossils
On Earth, there are large and small fossils. On Mars, large fossils are rare. Most fossils on Mars have been weathered and broken to fragments as small as cells and tissues. This fact is contrary to what people usually think of fossils. The small fossils on Mars had been mixed with minerals, possibly in molten state, before they came to the present state. To see Martian fossils clearly, meteorites are the right resources (note 1).
Note 1: Most meteorites contain small Martian fossils, proven in http://wretchfossil.blogspot.tw/2010/08/nearly-all-meteorites-displayed-on-ebay.html
Read more at http://wretchfossil.blogspot.tw