La Portada Formation

{{Infobox rockunit

| name = La Portada Formation

| image = Monumento Nacional La Portada, Antofagasta-Chile.JPG

| caption = View of La Portada, the namesake arch made of La Portada Formation rocks resting on darker rocks of Jurassic La Negra Formation

| type = Geological formation

| period = Pliocene

| age = Miocene–Pliocene

| prilithology = Sandstone

| otherlithology =

| namedfor = La Portada de Antofagasta

| namedby =

| region = Antofagasta Region

| country = Chile

| coordinates = {{coord|23.4|S|70.5|W|display=inline,title}}

| paleocoordinates = {{coord|23.6|S|69.5|W|display=inline}}

| unitof =

| subunits = Cerro Bandurrias & Cuesta del Burro Members

| underlies = Mejillones Formation

| overlies = Caleta Herradura Formation

| thickness =

| extent =

| area =

| map = {{Location map+ | Chile

| relief = 1

| width = 150

| float = center

| places =

{{Location map~ | Chile

| lat_deg = -23.4

| lon_deg = -70.5

| mark = Yellow ffff00 pog.svg

| marksize = 12

}}

}}

| map_caption =

}}

La Portada Formation ({{langx|es|Formación La Portada}}) is a geologic formation of Miocene and Pliocene age located near the Coast Range of northern Chile. The coarse-grained sandstones of the formation contain penguin fossils.[https://paleobiodb.org/classic/displayCollResults?collection_no=96707 Mejillones Peninsula] at Fossilworks.org{{cite conference |url=https://www.researchgate.net/publication/296637852 |title=Los pingüinos fósiles de Sudamérica |last1=Chávez |first1=Martín F. |date=2008 |book-title=Libro de Actas |pages=116–120 |conference=I Simposio - Paleontología Chile - 2008 |language=es }}