Pliable soft tissue containing detailed cellular structures has been detected in numerous dinosaur fossils. Studies have also reported extracting and identifying several animal proteins (e.g., collagen and actin) from this tissue. Since predicted decay rates are not consistent with tissue and biomolecules being preserved for millions of years, these findings challenge the assigned ages of the dinosaur fossils. Different explanations have been offered for how tissue could survive for extended periods of time. One explanation is that this tissue is actually a bacterial biofilm with a replica imprint of dinosaur cells and the biomolecules are of bacterial origin. Bacterial biofilms have even been shown to have a significant role in the fossilization processes. However, biofilms have not been shown to replicate the cellular detail found in dinosaur tissue. Also, amino-acid sequence, antibody affinity, and microspectroscopic analysis reveals significant difference between bacterial proteins and those proteins extracted from the soft tissue. Thus there is no substantial evidence that the pliable material extracted from dinosaur fossils is contaminating biofilm.