Figure 3. 1, Cardioichnus isp. Cabo San Pablo beds. CADIC PI 46. Positive hyporelief / hiporelieve positivo. 2, Cosmorhaphe isp. Cerro Colorado Formation. Positive hyporelief / hiporelieve positivo. 3-4, Curvolithus simplex. Leticia Formation. 3, Full relief preservation / preservación en relieve completo. 4, Lower bedding plane with bilobate, positive hyporelief and upper trilobate surface in negative hyporelief / vista basal en hiporelieve positivo bilobado y superficie trilobada en hiporelieve negativo. 5, Desmograpton ichthyforme. Cerro Colorado Formation. Positive hyporelief / hiporelieve positivo. 6, Gyrophyllites rehsteineri. Cabo Ladrillero beds. Full relief / relieve completo. 7, Gyrochorte comosa. Leticia Formation. Basal view showing two bilobate furrows separated by a narrow crest (arrows) crosscutting Curvolithus simplex (Cu) / vista basal mostrando dos surcos separados por una cresta (flechas) cortando a Curvolithus simplex (Cu). 8, Helicolithus ramosus. Cerro Colorado Formation. Positive hyporelief / hiporelieve positivo. 9, Helicolithus isp. Punta Torcida Formation. Positive hyporelief / hiporelieve positivo. 10, Helicorhaphe isp. Punta Torcida Formation. Positive hyporelief / hiporelieve positivo. Scale bar: 1 cm. Field phothographs except figure 3.1 / Escala: 1 cm. Fotografías de campo, excepto figure 3.1.