Armuelles Formation

{{short description|Costa Rican geological formation}}

{{Infobox rockunit

| name = Armuelles Formation

| image =

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| type = Formation

| age = Early Pleistocene

| period = Gelasian

| prilithology = Siltstone

| otherlithology = Sandstone, conglomerate

| namedfor = Puerto Armuelles

| namedby =

| region = Limón Province
Chiriquí Province

| country = {{CRI}}
{{PAN}}

| coordinates =

| unitof = Charco Azul Group

| subunits =

| underlies =

| overlies = Penita & Charco Azul Formations

| thickness =

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}}

The Armuelles Formation is a geologic formation in Costa Rica and Panama. It preserves fossils.[https://paleobiodb.org/classic/displayStrata?geological_group=Charco%20Azul&formation=Armuelles&group_formation_member=Armuelles Armuelles Formation] at Fossilworks.org