[ColdWater]

http://www.talkorigins.org/faqs/dinosaur/blood.html

Although they are not consistent with pyrite framboids, they may indeed be geological in origin, derived from some process as yet undefined; they may have their origin as colonies of iron-concentrating bacteria or fungal spores, or they may be the result of cellular debris, which clumped upon death, became desiccated, and then through diagenetic processes such as anion exchange or others not yet elucidated, became complexed with other, secondary degradation products. [Schweitzer and Horner (1999: 189)]

[fortheDeclaration]

Although they are not consistent with pyrite framboids, they may indeed be geological in origin, derived from some process as yet undefined; they may have their origin as colonies of iron-concentrating bacteria or fungal spores, or they may be the result of cellular debris, which clumped upon death, became desiccated, and then through diagenetic processes such as anion exchange or others not yet elucidated, became complexed with other, secondary degradation products. [Schweitzer and Horner (1999: 189)]