These feeding experiments for poultry with fossil meal were carried out to determine the value of a trace mineral supplement. A commercial trace mineral as a control and 0, 1.5, 3.0 and 4.5% fossil meals were used for broiler studies. The body weight gain, feed conversion and economics of these feedings were compared. For layer study, consumption and conversion of feed, production and quality of egg and shell thickness were examined in 1 to 4% fossil levels. The results obtained are summarized as follows: 1. In broiler experiment, the body weight gain in 1.5% fossil feeding was the highest and the control followed it, but no significant difference was shown between them. Low body weight gains were shown in the others. 2. The feed conversion and economics for these feedings presented same trend as that of body weight gain. The best results were obtained in 1.5% fossil feeding. 3. In layer study, the plots of fossil supplements consumed more feed than the control. The body weight with layering with fossil feeding was decreased less than the control. However, 4% feeding was exceptional. 4. The egg production of 1% plot was higher than the control, but there was no significant difference between them. However, production results obtained from the both feedings were significantly higher than the rest of higher fossil feeding groups. 5. The egg shell of 1% fossil feeding was shown slightly thicker than those of others. 6. The egg quality (Haugh Unit) was best shown (p$lt;0.01) compared to that of control.