The first appearance of Jinogondolella postserrata evolved from Jinogondolella aserrata is defined as the base of the Capitanian Stage which is in the upper part of the Pinery Limestone Member of the Bell Canyon Formation at the top of Nipple Hill (southeastern Guadalupe Mountains), at 4.5 m in the outcrop section on the south side of the hill with the top at 31.9091o N, 104.7892o W in USA.