Fig. 1: Photograph of an enantiornithine indet, STM10–12.

General view of the slab a and close-up on the purported ovarian follicles, all approximately the same size (pink arrows in b). Close-ups on these same structures (pink arrows) in the counterslab c. Two fragments were used for different analytical methods d. The first fragment (orange outline) was prepared using ground sectioning methods. The second fragment (blue outline) was demineralized and processed for paraffin histology. Abbreviations: Frag. fragment, sed sediment.