Puduhuapi Formation

{{Short description|Sedimentary formation in Chile}}

{{Infobox rockunit

| name = Puduhuapi Formation

| image =

| caption =

| type = Geological formation

| period = Miocene

| age = Miocene

| prilithology = Sandstone, siltstone, conglomerate

| otherlithology =

| namedfor = Puduhuapi Island

| namedby = Levi et al.

| year_ts = 1966

| region = Los Lagos Region

| country = Chile

| coordinates = {{coord|42|19|08.1|S|73|14|10.3|W|display=inline,title}}

| unitof =

| subunits =

| underlies =

| overlies =

| thickness = c. {{convert|35|m|ft|abbr=on}}

| extent = Puduhuapi Island

| area =

| map = {{Location map+ | Chile

| relief = 1

| width = 200

| float = center

| places =

{{Location map~ | Chile

| lat_deg = -42.318919

| lon_deg = -73.236184

| mark = Yellow pog.svg

| marksize = 12

}}

}}

| map_caption =

}}

The Puduhuapi Formation is a sedimentary formation whose only known outcrops are on Puduhuapi Island of the Chiloé Archipelago, west of Chaitén in western Patagonia, Chile. Lithologies vary from sandstone and siltstone to conglomerate. The sediment that now forms the rock deposited during the Miocene no earlier than 23 million years ago.{{cite book |last1=Encinas|first1=Alfonso |last2=Folguera|first2=Andrés|last3=Bechis|first3=Florencia|last4=Finger|first4=Kenneth L.|last5=Zambrano|first5=Patricio|last6=Pérez|first6=Felipe|last7=Benarbé|first7=Pablo|last8=Tapia|first8=Francisca|last9=Riffo|first9=Ricardo|last10=Buatois|first10=Luis|last11=Orts|first11=Darío|last12=Nielsen|first12=Sven N. |last13=Valencia|first13=Victor V.|last14=Cituño|first14=José |last15=Oliveros|first15=Verónica |last16=De Girolamo Del Mauro|first16=Lizet|last17=Ramos|first17=Víctor A.|date=2018 |chapter=The Late Oligocene–Early Miocene Marine Transgression of Patagonia|title=The Evolution of the Chilean-Argentinean Andes |editor1=Folguera, A. |editor2=Contreras Reyes, E. |editor3=Heredia, N. |editor4=Encinas, A. |editor5=B. Iannelli, S. |editor6=Oliveros, V. |editor7=M. Dávila, F. |editor8=Collo, G. |editor9=Giambiagi, L. |editor10=Maksymowicz, A. |editor11=Iglesia Llanos, M.P. |editor12=Turienzo, M. |editor13=Naipauer, M. |editor14=Orts, D. |editor15=D. Litvak, V. |editor16=Alvarez, O. |editor17=Arriagada, C. |publisher=Springer|pages=443–474 |isbn=978-3-319-67774-3 |author-link17=Víctor Alberto Ramos}}