Dear Ana Maria, Thank you for your help and patience. The presented object appears to be two fossils with measurements of 15 x 2 inches each. This fossil can be identified as lungfishes and all body parts are visible and preserved. Similar fossilization comes from Brazil and is exported to collectors of fossils in the United States and Europe. An exact zoologic identification on the base of images is sadly not possible. This piece is in good condition and there is no serious damage visible in the images provided. A fair market estimation would be between 120 to 300 USD each. This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary. With kind regards, George